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Caracterização de Unidades de Produção Leiteira na Região Sul do Rio Grande do Sul. 1. Sistemas de Produção. Repositório Alice
RIBEIRO, M. E. R.; ZANELA, M. B.; ROSA, P. P.; JUCHEM, S. de O.; ANTUNES, H. J. V.; D´ÁVILA, A. S..
2015
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Alimentação de bovinos; Holandês Jersey; Manejo de ordenha; Produção de leite; Feeds for cattle; Holstein; Jersey; Milking management; Milk production.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1022554
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Caudal vena cava thrombosis in a dairy cow (Bos taurus) in Argentina Ciência Rural
Schild,Carlos; Armendano,Joaquín Ignacio; Liboreiro,Matías; Bresky,Florencia; Morrell,Eleonora; Odriozola,Ernesto; Cantón,Germán.
ABSTRACT: Caudal vena cava thrombosis (CVCT) is an acute disease secondary to ruminal lactic acidosis and rumenitis with fatal outcome in cattle fed with a high-grain diet. The aim of this paper is to describe CVCT in an adult Holstein cow from a herd in Balcarce, Buenos Aires, Argentina. Clinical signs included dyspnea, weakness, recumbence, and hemoptysis, followed by death in 3.5 days. Important necropsy findings included multiple hepatic abscesses, a septic thrombus (4.0cm x 2.0cm) in the vena cava adjacent to the liver, and a 15cm hematoma in the right lung. Histological lesions observed in the pulmonary parenchyma included suppurative pneumonia with embolic bacterial colonies and severe interstitial fibroplasia. Dissociation and degeneration of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cattle; Holstein; Thrombosis; Vena cava; Hemoptysis.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000600551
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DETECCIÓN DE UN DEFECTO GENÉTICO EN BOVINOS MEDIANTE UNA PRUEBA DE ADN. Agricultura Técnica
Felmer D.,Ricardo; Butendieck B.,Norberto; Butendieck B.,Bárbara; Villegas M.,Juana.
La deficiencia en la capacidad de unión de leucocitos bovinos a los antígenos, más conocida como BLAD, es una enfermedad hereditaria que resulta letal para el ganado de la raza Holstein. Su principal característica es ser una enfermedad autosómica recesiva que puede ser transmitida a la descendencia. El objetivo del trabajo fue estandarizar la metodología para realizar un diagnóstico de la enfermedad mediante técnicas moleculares y lograr una primera aproximación sobre la frecuencia génica del alelo mutado en algunas poblaciones de toros de la IX y X Región. En base a la amplificación del ADN mediante reacción en cadena de polimerasa (PCR) y posterior digestión con enzimas de restricción Taq I y Hae III, fue posible visualizar, mediante electroforesis en...
Tipo: Journal article Palavras-chave: Deficiencia de adhesión leucocitaria bovina; BLAD; PCR; RFLP; Holstein; Enfermedad.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100005
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Effect of Liver Abscess and Complications on Carcass Grade of Holstein Steers OAK
日高, 智; 岩谷, 渡; 松長, 延吉; 左, 久; HIDAKA, Satoshi; IWAYA, Wataru; MATSUNAGA, Nobuyoshi; HIDARI, Hisashi.
ホルスタイン種去勢牛の肥育では,濃厚飼料を多給した集約的な飼養が行われているために,肝膿瘍や合併症に罹患した牛が多い. しかし,その発生状況や疾病が格付成績に及ぽす影響についてはよく知られていない.そこで本試験では, 肝膿瘍と合併症の発生状況を調査し,これらの疾病が枝肉重量,枝肉格付成績に及ぼす影響を,さらに疾病が与える経済的損失を検討した. 1993年4月から1994年3月までの1年間に十勝管内A町から出荷され,十勝畜産公社で解体された16,226頭のホルスタイン種去勢肥育牛の屠畜検査成績,枝肉格付成績を用いた.また,疾病牛の枝肉重量の減少と肝臓の廃棄損失から疾病による経済的損失額を試算した.供試牛のうちなんらかの疾病を持つ牛は,9,288頭で全供試牛の57%を占め,肝膿蕩擢患牛は32%で,その発生は5,6月および11-2月に多かった.肝膿瘍罹患牛のうち56%がlつ以上の合併症を併発しており,合併症では横隔膜炎,胃炎およひ小腸炎が多くみられた.正常牛と比べ肝膿瘍罹患牛では,合併症の数が増加するほど枝肉重量が減少した.枝肉格付成績では,正常牛と比較して,肝膿瘍と合併症が2つ以下の牛ではほぼ同様であった.しかし,合併症が3つ以上の牛では, B-3の割合が減少し, B-2,...
Palavras-chave: ホルスタイン種; 去勢牛; 肝膿瘍; 合併症; 枝肉格付; Holstein; Steer; Liver Abscess; Complications; Carcass Grade.
Ano: 1997 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2835
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Effect of organic sources of minerals on fat-corrected milk yield of dairy cows in confinement R. Bras. Zootec.
Del Valle,Tiago Antonio; Jesus,Elmeson Ferreira de; Paiva,Pablo Gomes de; Bettero,Vitor Pereira; Zanferari,Filipe; Acedo,Tiago Sabella; Tamassia,Luis Fernando Monteiro; Rennó,Francisco Palma.
This study evaluated the effects of organic and inorganic sources of minerals in diets for mid-lactation dairy cows on milk yield and composition, intake and total apparent digestibility of dry matter and nutrients, blood parameters, microbial protein synthesis, and energy and protein balances. Twenty Holstein cows averaging 146.83±67.34 days in milk and weighing 625.30±80.37 kg were used. The experimental design was a crossover. Diets were composed of corn silage (50%), ground grain corn, and soybean meal, differing with regard to the sources of trace minerals, plus an organic and inorganic mix. The organic mineral source increased milk fat and fat-corrected milk yield without changing milk yield, intake, or total apparent digestibility. Blood parameters,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Holstein; Milk fat; Mineral nutrition; Organic mineral.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000300103
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Energy and protein requirements of young Holstein calves in tropical condition. Repositório Alice
RODRIGUES, J. P. P.; LIMA, J. C. M.; CASTRO, M. M. D.; VALADARES FILHO, S. de C.; CAMPOS, M. M.; CHIZOTTI, M. L.; MARCONDES, M. I..
Our objective was to estimate the energy and protein requirements of Holstein young calves up to 87 days old. Forty-two Holstein calves aged 4 days were used. From these, ten were randomly selected and slaughtered to compose the baseline slaughter (BS) group. The remaining calves were randomly assigned to eight treatments in a 4 × 2 factorial using a completely randomized design. The treatments were 2, 4, 6, and 8 kg/day of milk (297 g/kg CP; 319 g/kg of fat) fed twice daily, and then harvested at 59 or 87 days of age. Calves were fed a starter (193 g/kg CP; 133 g/kg NDF) ad libitum in all treatments. The calves slaughtered at 87 days of age had milk replaced by Coast-cross (Cynodoon sp.) hay (125 g/kg CP; 728 g/kg NDF). The net requirement of energy for...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Comparative slaughter; Efficiency of utilization; Growth; Maintenance; Metabolizable energy; Metabolizable protein; Dairy calves; Holstein; Metabolizable energy; Slaughter.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1058344
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Estimation of Heritability for Somatic Cell Score of Holstein Cows in Hokkaido OAK
三浦, 伸也; 鈴木, 三義.
(社)北海道酪農検定検査協会の検定日記録を用い,体細胞スコアに対する影響要因を明らかにし,遺伝率を推定した.データは北海道酪農検定検査協会により,1991年2月から2003年3月までに集積された初産の869,114頭からの8,986,351の検定日記録,2産は619,883頭(6,370,190記録),3産は409,320頭(4,194,475記録)に関する泌乳量と体細胞スコアである.体細胞スコアの上昇により,乳量,乳成分量は減少を示し,とくにスコア6以上で急激な減少を示した.体細胞スコアの遺伝率は,Wilminkの泌乳曲線を利用した反復率モデルで,初産〜3産まで0.08,0.07,0.07と推定され,産次間での大きな変動は認められなかった.ルシャンドル多項式を利用した変量回帰モデルを用いた遺伝率推定値は,Wilminkの関数により得られたものより高く,とくに分娩直後および,乾乳前において高く推定された.モデル内の次数を2次から5次まで変化させることによる大幅な遺伝率の変化は認められなかったので,計算時間等を考慮すると3次程度が妥当な次数と考えられる.閾値モデルによる推定遺伝率は分析の中ではもっとも高く推定され,その有効性が示唆されたが,これに関してはさらに実用的な見地からの研究が望まれる.
Palavras-chave: Somatic cell score; Heritability; Random regression; Threshold model; Holstein.
Ano: 2006 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2598
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Genetic analysis of productive and reproductive traits in multiple-breed dairy cattle populations PAB
Ribeiro,Virgínia Mara Pereira; Merlo,Fernanda Albuquerque; Gouveia,Gabriela Canabrava; Winkelstroter,Larissa Kretli; Abreu,Luíza Rodrigues Alves; Silva,Marcos Vinícius Gualberto Barbosa da; Panetto,João Cláudio do Carmo; Paiva,Leandro de Carvalho; Cembranelli,Marcello de Aguiar Rodrigues; Toral,Fabio Luiz Buranelo.
Abstract: The objective of this work was to determine whether the random regression model using linear splines (RRMLS) is suitable to estimate the genetic parameters for productive and reproductive traits of a multiple-breed dairy cattle population, as well as to investigate the effect of the genetic group of the progeny on the genetic merit of the sire. The multiple-trait model (MTM) and the RRMLS with one knot fitted for every genetic group were used to obtain the genetic parameters. Records of 1/2 Holstein + 1/2 Gyr (1/2HG), 5/8 Holstein + 3/8 Gyr (5/8HG), and 3/4 Holstein + 1/4 Gyr (3/4HG) crossbreed dams were considered. The RRMLS showed better fitting. The additive and residual variances estimated by the MTM and the RRMLS were similar. Heritability...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gyr; Heritability; Heterosis; Holstein; Selection.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001101109
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Genetic Correlations of Milk Production and Type Traits with Somatic Cell Score from Holstein Cows in Hokkaido OAK
三浦, 伸也; 鈴木, 三義.
(社)北海道酪農検定検査協会の検定日記録および(社)日本ホルスタイン登録協会北海道支局の体型記録を用い,体細胞スコアと泌乳形質および体型形質との遺伝相関を推定した.各体型形質の記録数は審査開始時期の違いにより異なるが,多くの形質に共通な記録数を示すと,初産が181,291記録であり,2産が104,105記録,3産が30,973記録であった.遺伝相関の推定には,2形質分析モデルを用いた.母数効果としては,体細胞に対して,牛群・検定日,分娩月齢,分娩後日数の1次の回帰,分娩後日数に対するWilminkの指数項,体型形質に対しては,牛群・審査日,審査時月齢,泌乳ステージ,審査員の各効果を考慮し,さらに変量効果として両形質について,相加的遺伝効果と残差を含むモデルを用いた.体細胞スコアと乳生産形質との遺伝相関は−0.22〜0.15と低い値が推定され,初産において正の相関,2産以降では負の相関となる傾向が示された.体型形質と体細胞スコアとの遺伝相関は,産次により値が変動し,正負の符号の逆転が認められた.これは,加齢による体型変化に起因していると考えられる.体型形質の中で,乳房の深さ(−0.29〜−0.19)および前乳房の付着(−0.25〜−0.07)において,負の遺伝相関が推定された.これらの体型形質は生涯生産性,在群期間とも遺伝的な関連があり,これらの体型形質を改良することにより,体細胞スコアを低減することが可能であり,結果として生涯生産量の増加が期待できる.
Palavras-chave: Somatic cell score; Genetic correlation; Type trait; Milk production; Holstein.
Ano: 2005 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2597
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Genetic relationships of age at first calving, and reproductive traits of cows and yield traits for Holsteins in Hokkaido OAK
阿部, 隼人; 増田, 豊; 鈴木, 三義; MASUDA, Yutaka; SUZUKI, Mitsuyoshi.
初産分娩月齢と3産までの経産牛繁殖形質ならびに生産形質間について,AIREML法を用いた2形質アニマルモデルにより,遺伝的パラメータを推定した.記録は,(社)北海道酪農検定検査協会に集積された繁殖ならびに乳期記録,および(社)日本ホルスタイン登録協会北海道支局に集積された血統記録である.計算機の能力の制約からすべての記録を同時に分析することは困難であったため,牛群単位の無作為抽出により10万記録程度のサブセットを10個生成し,各サブセットに対し分析を行なった.遺伝率は,初産分娩月齢に対し0.22,経産牛繁殖形質に対し0.03~0.05と推定された.初産分娩月齢と経産牛繁殖形質との遺伝相関は絶対値で0.2を上回らなかった一方,生産形質との遺伝相関は2産以降で-0.3から-0.4と比較的高かった.2産以降の生産形質との好ましい関連から,初産分娩月齢の改良による長期的な生産性の向上の可能性が示された.
Palavras-chave: Age at first calving; Genetic correlation; Holstein; Reproductive traits of cows; Yield traits.
Ano: 2008 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3942
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Genotype×environment interaction in feeding systems and sire countries for Holsteins OAK
馬場, 俊見; 清水, 知佳; 橋本, 優子; 増田, 豊; 鈴木, 三義; MASUDA, Yutaka; SUZUKI, Mitsuyoshi.
北海道のホルスタイン初産個体の産乳形質に関して,飼養形態間および種雄牛の国籍間における遺伝と環境の交互作用を調査した.表型値に対する父牛の予測伝達能力の回帰係数を推定し,スケーリング効果の有無を調べた.さらに,飼養形態のみにおいて,各飼養形態の同一形質を別形質とみなし,アニマルモデルにより遺伝相関を推定した.飼養形態は放牧,舎飼いならびに不明の3クラス,種雄牛の国籍は日本,アメリカ,カナダおよびその他の4クラスに分類した.顕著なスケーリング効果が,放牧で確認された.種雄牛の国籍に関する回帰係数は,アメリカおよびその他で1を超え,カナダでは乳タンパク質量以外で有意に1を下回った.日本では,0.92~0.95であった.飼養形態間の遺伝相関は各組み合わせで0.98~0.99であった.放牧でスケーリング効果があったが,遺伝相関の結果は,飼養形態の違いを考慮する必要がないことを示唆した.
Palavras-chave: Feeding system; Genotype by environment interaction; Holstein; Sire country.
Ano: 2011 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3940
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Holstein white coat color and performance: phenotypic, genetic and environmental correlations Braz. J. Genet.
Becerril,Carlos M.; Wilcox,Charles J.; Guerrero,Victor M..
Correlations of measures of percentages of white coat color, five measures of production and two measures of reproduction were obtained from 4293 first lactation Holsteins from eight Florida dairy farms. Percentages of white coat color were analyzed as recorded and transformed by an extension of Box-Cox procedures. Statistical analyses were by derivative-free restricted maximum likelihood (DFREML) with an animal model. Phenotypic and genetic correlations of white percentage (not transformed) were with milk yield, 0.047 and 0.097; fat yield, 0.002 and 0.004; fat percentage, -0.047 and -0.090; protein yield, 0.024 and 0.048; protein percentage, -0.070 and -0.116; days open, -0.012 and -0.065; and calving interval, -0.007 and -0.029. Changes in magnitude of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Holstein; Phenotypic; Genetic; Environmental.
Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400009
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Methane emission intensities by Holstein and Holstein × Jersey crossbreed lactating cows in two Brazilian grazing systems. Repositório Alice
BERNDT, A.; LEMES, L. A.; ROMERO, T. C.; ALVES, A. M.; PEDROSO, A. de F.; OLIVEIRA, P. P. A..
2014
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Methane emission; Holstein; Jersey; Grazing sistem.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1003655
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Milk production of crossbred Holstein × Zebu cows in the northeastern region of Paraná State R. Bras. Zootec.
Perotto,Daniel; Kroetz,Inácio Afonso; Rocha,José Lázaro da.
The objective of this work was to evaluate milk production of a Holstein × Zebu herd managed on a semiintensive system at Estação Experimental Joaquim Távora, IAPAR, in the northeastern region of Paraná - Brazil. Two hundred and seventeen records on milk production per lactation period (MY), milk production up to 305 days of lactation (MY305) and length of lactation period (LL) of 82 crossbred cows varying in breed composition were analyzed according to a linear statistical model that included the fixed effects of breed composition, season and year at onset of lactation, order of parturition and place of birth, in addition to the experimental error. Cows born in Joaquim Távora had longer lactation periods and produced more milk than cows born in Ibiporã....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crossbreeding; Holstein; Zebu; Lactation length; Semi-intensive system.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400009
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Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture. Repositório Alice
PORTO, M. O.; PAULINO, M. F.; VALADARES FILHO, S. de C.; DETMANN, E.; CAVALI, J.; SALES, M. F. L.; VALENTE, E. E. L.; COUTO, V. R. M..
The objective of this study was to estimate requirements of energy, protein and macrominerals of young Nellore/Holstein crossbreds bulls supplemented on pastures of Brachiaria decumbens Stapf. Thirty-five young bulls, at 8.53±0.18 months of age and with initial body weight of 230.6±6.1 kg were used. Ten animals were slaughtered as reference, in different weight range, and the other animals were slaughtered at the end of the experimental period. For estimate of net energy requirements for weight, a regression equation between log of retained energy (RE) and log of empty body weight gain (EBWG) was constructed. Net requirements of Ca, P, Mg, Na and K were determined by the equation Y' = a.b.Xb-1, in which a and b represent the intercept and the coefficient...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Nelore x Holstein; Gado de corte; Nutrição animal; Pastagem; Gramínea forrageira; Capim Brachiaria; Brachiaria decumbens; Suplemento mineral; Nutriente mineral; Proteína; Energia; Ganho de peso; Touro; Bezerro mestiço; Gado Nelore; Gado Holandês; Beef cattle; Animal nutrition; Pastures; Forage grasses; Dietary mineral supplements; Dietary energy sources; Dietary protein; Weight gain; Young animals; Crossbreds; Bulls; Nellore; Holstein; Ganado de carne; Pastizales; Nutrición animal; Suplementos dietéticos minerales; Fuentes energéticas dietéticas; Proteína dietética; Pastos forrajeros; Animales jóvenes; Aumento de peso; Productos del cruzamiento; Toros; Raza de bovinos Nelore; Raza de ganado Holstein.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/927192
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Pericardial mesothelioma with severe congestive heart failure in a Holstein cow OAK
Suzuki, Haruka; Watanabe, Ken-ichi; Horiuchi, Noriyuki; Kobayashi, Yoshiyasu; Inokuma, Hisashi.
A 58-month-old Holstein cow showed anorexia, edema of the lower jaw and dewlap, jugular venous engorgement, abdominal gas, and watery diarrhea. Heart sounds were faint on auscultation, and decreased rumen motility was noted in physical examination. Echocardiography findings included adhesion of fibrin-like structures to the pericardium, highly echogenic periaortic region, and pericardial effusion, which suggested traumatic pericarditis or tumor formation. Although atypical mesothelial cells were observed in bloody pericardial fluid, no diagnosis was made. At complete necropsy, milky mass formation was observed on the epicardium. Histopathological examination led to a diagnosis of primary malignant pericardial mesothelioma. © 2017, Hokkaido University. All...
Palavras-chave: Congestive heart failure; Holstein; Pericardial mesothelioma.
Ano: 2017 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4561
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Phenotypic and genetic factors of twinning rate in Japanese Holsteins OAK
馬場, 俊見; 金子, 瞳; 増田, 豊; 鈴木, 三義; MASUDA, Yutaka; SUZUKI, Mitsuyoshi.
本研究では,2000年から2007年に北海道で分娩した3産までのホルスタイン種を用いて,双子率に対する表型および遺伝的要因を調査した.表型分析は,産次ごとおよびすべての産次を含んだデータセットに対するロジスティック回帰分析でそれぞれ行った.遺伝分析には閾値反復アニマルモデルを用いた.双子は,2004年以降増加傾向にあった.夏の季節の分娩は,双子の出生リスクが高かった.初産では,分娩月齢が遅い個体ほど双子の出生リスクが高かった.2産では月齢の影響は小さく,3産でみとめられなかった.しかし,産次を重ねるほど双子の出生リスクが増加した.2産および3産ではそれぞれ前産次の乳量クラス,空胎日数クラスならびに産子の区分も有意な影響を示した.双子率の遺伝率および反復率は,それぞれ0.18および0.19であり,直接選抜による双子率の遺伝的改良が可能であることを示唆した.
Palavras-chave: Genetic parameter; Holstein; Phenotypic factor; Twinning rate.
Ano: 2012 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3939
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Profitability measures of dairy cows R. Bras. Zootec.
Ribeiro,Anamaria Cândido; McAllister,Alan Jackson; Queiroz,Sandra Aidar de.
This study was aimed at defining profitability measures designed for prediction of breeding values (EBV) in dairy cows. Performance and economic data recorded in herds enrolled in the DHIA (Dairy Herd Improvement Association) program in Kentucky, USA, were used to evaluate economic functions which included the following profitability measures: lifetime net income (LNI), efficiency (EF), milk income over feed costs (IOFC), net income per day of productive life (NIPL), net income at the end of the first lactation (NI1), and milk income over feed costs at the end of the first lactation (IOFC1). The estimated averages for LNI, EF, IOFC, NIPL, NI1 and IOFC1 were respectively US$ 532.13, 1.04, US$ 3038.19, US$ -0.16, US$ -69.34 and US$ 1293.77. The heritability...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Efficiency; Holstein; Lifetime income; Milk yield.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008000900012
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Relationships among Estimates of Additive Genetic Variance, Dominance Genetic Variance and Inbreeding Depression for Type Traits in Holstein Population of Japan OAK
河原, 孝吉; 後藤, 裕作; 山口, 諭; 鈴木, 三義.
本分析では,ホルスタインの体型形質に関する相加的遺伝分散,優性遺伝分散および近交退化量の関連性を調査した.体型記録は,日本ホルスタイン登録協会北海道支局において1984年4月から2002年3月までの期間に体型審査を実施した244,078頭の雌牛から抽出された.使用した形質は,6の体型得点形質および16の線形式体型形質であった.分析には,母数効果として牛群・年次,泌乳ステージ,審査月齢および近交退化量,変量効果として個体,両親の組合せおよび残差が含まれた単記録モデル(SM),さらに変量として永続的環境効果を追加した反復記録モデル(RM)を使用した.各変量効果の分散成分は,Method Rを使用して推定した.全分散に対する相加的遺伝分散の比率(狭義の牛群内遺伝率)は,SMからの推定値において5.5%(蹄の角度)から45.2%(高さ),RMに関して5.6%(蹄の角度)から46.5%(高さ)の範囲であった.同様に優性遺伝分散の割合は,SMにおいて0.8%(蹄の角度)から7.0%(体積),RMにおいて0.4%(蹄の角度)から6.4%(体積)の範囲で推定された.SMから推定された近交退化量は,尻の角度,後肢側望,前乳房の付着,乳房の深さおよび乳頭の配置に関して正の値(0.000/%から0.012/%),それ以外の形質は−0.046/%(体積)から−0.001/%(後乳房の高さ)の範囲で負の値を示した.RMから推定された近交退化量は,後肢側望および後乳房の高さ以外,SMから推定された近交退化量と傾向が類似していた.相加的遺伝分散の比率と優性遺伝分散の比率との関係は有意(P<0.01)な正,近交退化量は優性遺伝標準偏差と有意(P<0.01)な負の関係が認められた.
Palavras-chave: Additive variance; Dominance variance; Holstein; Inbreeding depression; Type trait.
Ano: 2007 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2604
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Relationships between objective evaluation values of carcass and eating quality traits for Tokachi Wakaushi® OAK
山本, 紫乃; 伊藤, 信一; 坪坂, 修二; 脇坂, 巧; 岡田, 繁; 山口, 悠; 前田, さくら; 口田, 圭吾; KUCHIDA, Keigo.
ホルスタイン種若齢肥育牛である十勝若牛において,消費者による食味評価と枝肉の客観的評価値との関連性について調査した.画像解析形質(5形質),枝肉格付形質(4形質)およびMUFA割合を客観的評価値とした.食味試験は異なる(一部同じ)個体から得た十勝若牛14頭のロースまたはサーロインのステーキ肉を2点比較法により実施し,1,074の有効回答を得た.消費者の食味形質は,香り,柔らかさ,ジューシーさ,好ましさの4項目とした.客観的評価値と食味形質との関連性について,形質間の相関係数を算出した.食味形質間の相関係数は,香りと柔らかさ,香りと好ましさ以外で0.63から0.88と高い相関関係が得られた(P<0.05).また,客観的評価値と食味形質では,脂肪面積割合とジューシーさ(0.77),肉色の詳細評価値であるiBCSと柔らかさ(−0.70),月齢と柔らかさ(−0.66)などで中程度の相関が示された(P<0.01).以上より,十勝若牛では,脂肪面積割合,iBCS,月齢などが食味形質と関係しており,これらを用いることで,食味予測の可能性が示唆された.
Palavras-chave: Eating quality; Holstein; Image analysis; Yearling beef.
Ano: 2014 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4082
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