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| Registros recuperados: 45 | |
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| OLIVEIRA, S. M. P. de; LIMA, F. de A. M.; FONSECA, C. G. da; SILVA, F. L. R. da; GUEDES, S. P. P. de A.. |
| Resumo: Os dados utilizados neste estudo são oriundos de 1008 lactações, referentes a 27.303 controles semanais de 346 cabras 1/2 Pardo-Alpina x Moxotó. As funções Quadrática (FQ) e Quadrática Logarítmica (FQL) foram ajustados por regressão linear e as funções Gama Incompleta (FGI), Polinômio Segmentado Quadrático-Quadrático (FPSQQ) e Difásica (FD) foram ajustadas por processo iterativo. Os critérios utilizados para verificar a qualidade do ajuste para cada função foram: Coeficiente de Determinação Ajustado (Ra2), porcen-tagem de desvios entre as produções totais observadas e estimadas (DPLE), porcentagem de curvas típicas e estimativas das características da curva como produção e tempo de pico da lactação (PP e TP). A FQ, FQL e PSQQ estimaram os menores... |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Caprino leiteiro; Função matemática.; Cabra Leiteira; Curva de lactação.; Dairy goats; Milk yield; Lactation curve; Crossbreds.. |
| Ano: 2002 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/903798 |
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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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| LUCKNER, M. N.; CARNEIRO JUNIOR, J. M.; PINHEIRO, A. K.; RANUCCI, R. C.; CAVALCANTE, F. A.; SILVA, M. S.. |
| O objetivo deste estudo foi avaliar o uso de grupos genéticos bovinos para produção de leite em sistema intensivo de pastagem no Acre. Foram utilizados dados de produção leiteira de 46 matrizes do grupo genético Girolando e 59 do cruzamento Nelore x Holandesa denominado Nelorando em propriedade localizada no município de Rio Branco, AC. Foram analisados os parâmetros de produção de leite, intervalo entre partos, duração de lactação e produção de leite ajustada para 270 dias de 167 lactações com 1.499 controles de produção diária agrupados em quatro épocas do ano de controle. As estimativas dos parâmetros genéticos foram obtidas pelo método REML/BLUP. A média estimada para produção de leite aos 270 dias de lactação e o desvio-padrão foram de 2.474,70 ±... |
| Tipo: Parte de livro |
Palavras-chave: Nerolando; Tierras de pastoreo; Elaboración de leche; Intervalo posparto; Rendimiento lechero; Fazenda Rancho Vitrine; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Sistema de Pastejo; Produção Leiteira; Intervalo de Parto; Lactação; Produtividade; Rebanho; Girolando; Grazing lands; Milk production; Postpartum interval; Milk yield. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1145987 |
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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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| LOBO, A. M. B. O.; LOBO, R. N. B.. |
| A caprinocultura leiteira no Brasil vem se consolidando nos últimos anos, seja pelo aumento na produção no Nordeste alavancada por políticas públicas, seja pelo aumento na oferta de derivados lácteos, com alto valor agregado, observado com maior intensidade nas regiões Sul e Sudeste do País. Esse crescimento, ao exemplo do que ocorreu em outros países tropicais e subtropicais, tem sido sustentado pelo uso de material genético importado, notadamente de países da Europa, de raças como a Saanen, as Alpinas e a Toggenburg, e ainda a Anglo Nubiana. No entanto, a base de dados sobre o potencial de produção e a composição em constituintes lácteos dessas raças puras e de suas cruzas, ainda não está bem caracterizada nos países de clima tropical e subtropical,... |
| Tipo: Folhetos |
Palavras-chave: Desempenho; Extrato seco; Duração da lactação; Anglo Nubiana; Alpina; PL305; Dry extract; Lactose proportion; 305-day lactation yield; Lactation lenght; Crossbreeding; Fats; Milk performance.; Caprino; Cabra leiteira; Melhoramento genético animal; Performance; Cruzamento; Leite de cabra; Produção leiteira; Proteína; Gordura; Lactose; Goats; Animal genetics; Genetic improvement; Lactation duration; Goat milk; Milk yield; Proteins; Saanen; Toggenburg.. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1035307 |
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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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| Hassan, Laila Khaled; Shazly, Ahmed Behdal; Kholif, Abd El-Kader Mahmoud; Sayed, Ahmed Farouk; El-Aziz, Mahmoud Abd. |
| Produce and compare soft cheese with potential benefits of human health from Egyptian buffalo's and cow's milk was studied. Eight Egyptian lactating buffalos and cows were fed a total mixed ration supplemented with either 0% oil (CD), 2% flaxseed oil (DFO), 2% soybean oil (DSO), or 2% of their mixture (1:1, DFSO) according to a double 4 x 4 Latin Square design. Milk yield was similar between buffalo's diets but was higher in cows fed a DFO, DSO or DFSO resulting in 11.15, 8.21% or 8.97% increases compared with the control diet, respectively. Milk composition was not significantly affected in both buffalos and cows fed diets. The DFO, DSO or DFSO displayed decreased short-chain fatty acids, especially DSO and DFSO (3.73 and 3.33%, respectively) when... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Flaxseed oil; Soybean oil; Milk yield; Fatty acids profile; Antioxidant activity soft cheese properties.. |
| Ano: 2020 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/47200 |
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| STUMPF, M. T.; KOLLING, G. J.; FISCHER, V.; DALTRO, D. dos S.; ALFONZO, E. P. M.; DALCIN, V. C.; DIAS, L. T.; SILVA, M. V. G. B.; PERIPOLLI, V.; MCMANUS, C. M.. |
| Bos taurus taurus and Bos taurus indicus cattle subspecies present different capabilities in coping with situations of elevated temperatures, the latter being more tolerant to heat stress. Thus, some breeding programs crossed these subspecies to produce a high producing yet heat-tolerant breed (Girolando). Nineteen Holstein (H100) and 19 Girolando cows [(½ Holstein × Gir (H50) and ¾ Holstein × Gir (H75)] with similar milk production were used in a six-day experiment to evaluate the consequences of heat stress due to shade deprivation on their physiological, blood and milk traits. Cows were exposed to a non-shaded environment between morning (06:00h; GMT -3:00) and evening milking (14:30h; GMT -3:00) with access to water ad libitum. Procedures were... |
| Tipo: Artigo de periódico |
Palavras-chave: Blood alterations; Alteração sanguínea; Tolerância ao calor; Gado Leiteiro; Produção Leiteira; Fisiologia; Dairy cattle; Heat tolerance; Milk yield; Physiology. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1136549 |
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| Tonhati,H.; Muñoz,M.F.C.; Duarte,J.M.C.; Reichert,R.H.; Oliveira,J.A.; Lima,A.L.F.. |
| Correction factors for milk yield at 90, 240, 270 and 305 days of lactation of buffaloes and genetic and environmental parameters for milk yield of these lactation periods were estimated. The data used consisted of 3888 lactation records of 1630 buffaloes from 10 herds reared in the State of São Paulo. Genetic parameters were estimated by the derivative free restricted maximum likelihood method, fitting an animal repeatability model. Heritability estimates for milk yield corrected for 90, 240, 270 and 305 days of lactation were 0.17, 0.15, 0.14 and 0.14, respectively. In this same order, repeatability estimates were 0.40, 0.44, 0.41 and 0.41. The genetic correlation estimates between these corrected milk yields ranged from 0.96 to 1.00. The multiplicative... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Buffalo; Lactation length; Milk yield. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352004000200016 |
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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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| Ferreira,Abílio G.T.; Henrique,Douglas S.; Vieira,Ricardo A.M.; Maeda,Emilyn M.; Valotto,Altair A.. |
| The objective of this study was to evaluate four mathematical models with regards to their fit to lactation curves of Holstein cows from herds raised in the southwestern region of the state of Parana, Brazil. Initially, 42,281 milk production records from 2005 to 2011 were obtained from "Associação Paranaense de Criadores de Bovinos da Raça Holandesa (APCBRH)". Data lacking dates of drying and total milk production at 305 days of lactation were excluded, resulting in a remaining 15,142 records corresponding to 2,441 Holstein cows. Data were sorted according to the parity order (ranging from one to six), and within each parity order the animals were divided into quartiles (Q25%, Q50%, Q75% and Q100%) corresponding to 305-day lactation yield. Within each... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Milk yield; Mathematical models selection; Non-linear models. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100503 |
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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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| DIAVÃO, J.; SILVA, A. S.; SGUIZZATO, A. L. L.; SILVA, C. S. da; TOMICH, T. R.; PEREIRA, L. G. R.. |
| Sustainability - the new hype of the 21st century has brought discomfort for the government and society. Sustainable agriculture is essential to face our most concerning challenges: climate change, food security, and the environmental footprint, all of which add to consumers' opinions and choices. Improvements in reproductive indexes can enhance animal production and efficiency, guaranteeing profit and sustainability. Estrus detection, artificial insemination (AI), embryo transfer (ET), estrus synchronization (ES), and multiple ovulations are some strategies used to improve animal reproduction. This review highlights how reproductive strategies and genetic selection can contribute to sustainable ruminant production. Improved reproductive indices can reduce... |
| Tipo: Artigo de periódico |
Palavras-chave: Genetic selection; Methane emission; Methane intensity; Emissão de metano; Intensidade de metano; Gado Leiteiro; Fertilidade Animal; Seleção Genética; Metano; Produção Leiteira; Animal fertility; Methane; Milk yield. |
| Ano: 2023 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1156031 |
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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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| Registros recuperados: 45 | |
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