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| Registros recuperados: 32 | |
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| Geha,Makram J.; Keown,Jeffrey F.; Van Vleck,L. Dale. |
| Milk yield records (305d, 2X, actual milk yield) of 123,639 registered first lactation Holstein cows were used to compare linear regression (y = β0 + β1X + e) ,quadratic regression, (y = β0 + β1X + β2X2 + e) cubic regression (y = β0 + β1X + β2X2 + β3X3 + e) and fixed factor models, with cubic-spline interpolation models, for estimating the effects of inbreeding on milk yield. Ten animal models, all with herd-year-season of calving as fixed effect, were compared using the Akaike corrected-Information Criterion (AICc). The cubic-spline interpolation model with seven knots had the lowest AICc, whereas for all those labeled as "traditional", AICc was higher than the best model. Results from fitting inbreeding using a cubic-spline with seven knots were compared... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Akaike's information criterion; Cubic-spline interpolation; Inbreeding; Milk yield. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000300013 |
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| Deng,Chanjuan; Ma,Rongnuan; Yue,Xiangpeng; Lan,Xianyong; Chen,Hong; Lei,Chuzhao. |
| The association of IGF-I gene polymorphisms with certain traits in 708 individuals of two Chinese dairy-goat breeds (Guanzhong and Xinong Saanen) was investigated. Polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) and DNA sequencing methods were employed in screening for genetic variation. Two novel mutations were detected in the 5'-flanking region and in intron 4 of IGF-I gene, viz., g.1617 G > A and g.5752 G > C (accession D26119.2), respectively. The associations of the g.1617 G > A mutation with milk yield and the body size were not significant (p > 0.05). However, in the case of g.5752 G > C, Xinong Saanen dairy goats with the CG genotype presented longer bodies (p < 0.05). Chest circumference (p < 0.05)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: IGF-I gene; Dairy goat; Milk yield; PCR- SSCP. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200012 |
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| Córdova,Helder de Arruda; Alessio,Dileta Regina Moro; Cardozo,Leonardo Leite; Thaler Neto,André. |
| Abstract: The objective of this work was to evaluate the impact of production factors on milking frequency and the latter’s effect on animal welfare in robotic milking. The experiment was performed with Holstein Friesian cows housed in free-stall barns. To assess the impact of production factors, body condition score, milk yield, and concentrate intake were determined. To determine the effects of the milking frequency on welfare, the locomotion and teat-end scores and serum cortisol level were evaluated. Three experimental groups were formed according to the daily average milking frequency: 1.0 to 1.9, 2.1 to 2.9, and above 3.0 milkings per day. The decrease in milking frequency during lactation was related to the reduction in concentrate intake and milk... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cortisol; Free-stall system; Lactation; Milk yield; Voluntary milking system. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000200238 |
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| Freitas,Wandemberg Rocha; Ferreira,Marcelo de Andrade; Silva,Janaina Lima; Véras,Antônia Sherlânea Chaves; Barros,Leonardo José Assis; Alves,Adryanne Marjorie Souza Vitor; Chagas,Juana Catarina Cariri; Siqueira,Thamires Damascena Quirino; Almeida,Gleidiana Amélia Pontes de. |
| Abstract: The objective of this work was to evaluate the effects of different levels of sugarcane bagasse, as exclusive roughage, on nutrient intake and digestibility, feeding behavior, microbial protein synthesis, and dairy performance of crossbred cows. Ten lactating Girolando breed cows (600±34.3 kg body weight) were assigned to a replicated 5×5 Latin square design. The control diet, based on spineless cactus, sugarcane bagasse, and concentrate, was formulated to meet the average production of 20 kg of milk per day, with 3.5% fat. The evaluated levels of sugarcane bagasse were: 30, 38, 46, and 54% dry matter bases. The intake and digestibility of dry matter decreased linearly with sugarcane bagasse levels. Rumination time was higher in cows fed 54%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alternative roughage; Digestibility; Feeding behavior; Milk yield. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000300386 |
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| Buzas, Gyula; Szabo, Ferenc. |
| Azt vizsgáltuk, hogy a különböző mennyiségű, zsír- és fehérjetartalmú tejet termelő szarvasmarhafajták (holstein-fríz, magyar tarka, jersey) esetében miképpen alakulnak a tejtermelés bevételei és költségei, valamint azt, hogy a koncentráltabb tejért fizetett felárak és a feldolgozásukban jelentkező költségmegtakarítás milyen arányban állnak egymással. Megállapítható volt, hogy a tehenészetek mindhárom fajtánál, a jelenlegi árviszonyok mellett, némi jövedelmet csak a költségvetési támogatásoknak köszönhetően érnek el. A tejtermelésben a fajták versenyképessége legpontosabban a termelési érték és a takarmányköltség különbözete alapján ítélhető meg, az egyéb költségek többségének alakulása ugyanis nem a fajtától függő. A magyar tarka a tejtermelésben nem... |
| Tipo: Article |
Palavras-chave: Tejhozam; Tejzsír; Tejfehérje; Tejfeldolgozás; Felárak; Milk yield; Milk fat; Milk protein; Milk processing; Premiums; Livestock Production/Industries; Production Economics. |
| Ano: 2011 |
URL: http://purl.umn.edu/119898 |
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| Koluman,Nazan; Boga,Mustafa; Silanikove,Nissim; Gorgulu,Murat. |
| ABSTRACT The objective of the study was to investigate milk yield and eating behaviour of crossbred goats, German Improved Fawn × Hair crossbred (GIF) and Saanen × Hair goats (S), in subtropical eastern Mediterranean climate of Turkey during early summer season. Eight GIF and eight S goats were individually housed in 1.5 × 1.5 m pens. Diurnal eating patterns were monitored by a system that recorded meal size and meal length. Milk yield (kg/day) was 1.77 in GIF and 2.0 in S goats, whereas milk production efficiency (kg feed/kg milk) was 1.15 in GIF and 1.07 in S goats. The differences between GIF and S goats in eating behaviour parameters were significant: the S goats had higher meal size and meal length and longer inter-meal interval, meal time, and eating... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: German Fawn; Goat; Saanen; Milk yield. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016001200768 |
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| 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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| Oliveira,Tadeu Silva de; Leonel,Fernando de Paula; Silva,Cássio José da; Baffa,Danielle Ferreira; Pereira,José Carlos; Zervoudakis,Joanis Tilemahos. |
| The objective of this study was to present some factors affecting feed efficiency in dairy goats. To develop our work, individual and average data from performance experiments with lactating goats were used. The following variables were evaluated: gross feed efficiency, adjusted feed efficiency, dry matter intake, milk-yield, 3.5% fat-corrected milk yield, dry matter digestibility, dietary neutral detergent fiber content, different roughage-to-concentrate ratios and body weight. The statistical analyses involved the application of descriptive and dispersion measures besides Pearson's correlation coefficient and linear regression analysis. The analyzed variables were highly correlated with feed efficiency. The feed efficiency of lactating goats was affected... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dry matter intake; Goat; Milk yield. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014001000524 |
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| Henao-Velásquez,Andrés F.; Múnera-Bedoya,Oscar David; Herrera,Ana Cristina; Agudelo-Trujillo,Jorge H.; Cerón-Muñoz,Mario Fernando. |
| The objective of this study was to evaluate lactose and milk urea nitrogen (MUN) in milk from Holstein cows and their relationship with days in milk (DIM), milk yield, milk fat, milk protein, and somatic cell count (SCC). A total of 1,034 records corresponding to morning and afternoon milkings of 148 Holstein cows were used. Records were taken from 16 herds located in the Northern and Eastern dairy regions of Antioquia (Colombia). The curves were fitted using a generalized additive mixed model with smoothed estimates to find the best smoothing intensity factors involved in MUN and lactose concentration. Regarding MUN, the contemporary group effect was highly significant, but the parity effect was not significant. The DIM, lactose and milk fat smoothed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Generalized additive model; Milk metabolites; Milk yield. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000900479 |
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| Biassus,Igor de Oliveira; Cobuci,Jaime Araújo; Costa,Claudio Napolis; Rorato,Paulo Roberto Nogara; Braccini Neto,José; Cardoso,Leandro Lunardini. |
| The objective of this study was to estimate genetic parameters for milk, fat and protein yields of Holstein cows using 56,508; 35,091 and 8,326 test-day milk records from 7,015, 4,476 and 1,114 cows, calves of 359, 246 and 90 bulls, respectively. The additive genetic and permanent environmental effects were estimated using REML. Random regression models with Legendre polynomials from order 3 to 6 were used. Residual variances were considered homogeneous over the lactation period. The estimates of variance components showed similar trends, with an increase of the polynomial order for each trait. The heritability estimates ranged from 0.14 to 0.31; 0.03 to 0.21 and 0.09 to 0.33 for milk, fat and protein yield, respectively. Genetic correlations among milk,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fat yield; Herdability; Milk yield; Protein yield; Test-day. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100012 |
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| Andrade,Vinícius Raimundi; Leonel,Fernando de Paula; Villela,Severino Delmar Junqueira; Carvalho,Juliana do Carmo; Araújo,Raphael Pavesi; Carvalho,Jonas Marco de; Machado,Henrique Valentim Nunes; Zervoudakis,Joanis Tilemahos. |
| The objective was to evaluate intake and digestibility of nutrients, as well as milk production and composition of the milk from F1 Holstein × Gyr cows kept on pasture, supplemented with sugarcane and concentrate (28% CP). Five cows with 150±14 lactation days and average milk production of 7.1±2.1 kg/day were distributed in a 5 × 5 Latin square design. The treatments were: soybean meal-based concentrate; soy bean-based concentrate; ground soybean-based concentrate; roasted soybean-based concentrate; and ground, roasted soybean-based concentrate. Dry matter (DM), organic matter, crude protein (CP), neutral detergent fiber (NDF), total carbohydrates and total digestible nutrients intakes were not affected by the diet, but ether extract intake was higher for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alternative feeds; Intake; Milk composition; Milk yield. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000200037 |
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| Santos,Viviany Lúcia Fernandes dos; Ferreira,Marcelo de Andrade; Guim,Adriana; Silva,Fabiana Maria da; Urbano,Stela Antas; Silva,Emmanuelle Cordeiro da. |
| Alternative sources of protein for lactating cows were evaluated in this study with respect to intake, digestibility, milk yield and milk composition. Eight multiparous Holstein/Gyr cows were simultaneously distributed in two 4 × 4 latin squares. Each experimental period lasted 21 days (14 days for adaptation and seven days to collect data and samples). Three protein sources, cottonseed meal, semi-integral soybean meal and corn steep liquor were evaluated and soybean meal was used as a control. When the corn steep liquor was used, lower intakes of dry matter, organic matter, crude protein and total digestible nutrients were observed compared with soybean meal. Animals that consumed corn steep liquor had a lower milk yield than those fed soybean meal, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: By-product; Digestibility; Intake; Milk yield. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001000019 |
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| Karadas,Koksal; Birinci,Avni. |
| ABSTRACT This study was conducted to compare predictive performances of different data-mining algorithms for determining factors influencing the average daily milk yield at dairy cattle enterprises of Ardahan province, located in the Eastern Anatolia region of Turkey. The algorithms employed in the present study were Classification and Regression Tree (CART), Chi-Square Automatic Interaction Detector (CHAID), Exhaustive Chi-Square Automatic Interaction Detector (Exhaustive CHAID), Multivariate Adaptive Regression Splines (MARS), and Multilayer Perceptron (MLP). The MARS algorithm outperformed the other algorithms in the study. Visual results of CART revealed that the culture-breed cows with a lactation length greater than 237.500 days had the highest milk... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Milk yield; Production economics; Statistical model. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100106 |
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| Gomes,Raphael dos Santos; Oliveira,Tadeu Silva de; Pereira,José Carlos; Vieira,Ricardo Augusto Mendonça; Henrique,Douglas Sampaio; Fernandes,Alberto Magno; Leonel,Fernando de Paula. |
| ABSTRACT Ten Holstein-Zebu crossbred cows distributed into two simultaneous Latin squares (5 × 5) as a 2 × 2 factorial arrangement formed by chopped sugarcane or elephant grass silage, both with high or low protein degradability supplements and a corn silage as a control treatment, were compared using orthogonal contrasts. The studied variables were the performance, plasma concentrations of urea-N, glucose, and creatinine, urine-N and milk urea-N, and the nychthemeral variation in NH3-N in the rumen fluid of dairy cows. Nutrient intake, milk production, and milk composition were affected by the treatments. The total mixed ration containing elephant grass silage combined with rumen undegradable protein (RUP) provided balanced amounts of carbon and nitrogen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Intake; Milk yield; Nitrogen metabolites; Tropical forages. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000900572 |
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| Registros recuperados: 32 | |
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