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Estudio de efectos ambientales y genéticos que influyen en la producción de leche y duración de lactación en bovinos de raza guzerat
(Livestock Research for Rural Development, 2011-07-01) [Artigo]
Objective of present work was study a influence of environmental and genetic effects over characteristics of milk total production (PL) and lactation duration (DL), from 2572 lactations of 477 Guzerat cows, collected since ...
Variance heterogeneity for milk yield in Brazilian and Colombian Holstein herds
(Livestock Research for Rural Development, 2004-04-01) [Artigo]
Heterogeneity of variances for milk yield (MY) was determined for Brazilian and Colombian herds. The herds were grouped as high or low variability within each country, using as criterion the phenotypic standard deviation ...
Relación entre el recuento de células somáticas y la producción de leche de búfalas en el estado de São Paulo, Brasil
(Livestock Research for Rural Development, 2006-01-01) [Artigo]
Mastitis is an inflammatory process in the udder that can affect the quality and quantity of milk produced causing economic losses and risks for health. Considering the somatic cell count (SCCs) as indicator of udder health ...
Evaluación genética de búfalos de la raza Murrah para la producción de leche en el día de control y a los 305 días de lactancia
(Livestock Research for Rural Development, 2009-01-01) [Artigo]
There were analyzed 4757 complete lactations of the Murrah breed, daughters of 187 bulls, with the goal of verifying the viability upon employing the test-day (PDLC), on substitution of the milk yield at 305th day of ...
Polymorphisms in the ghrelin gene and their associations with milk yield and quality in water buffaloes
(Journal of Dairy Science, 2013-05-01) [Artigo]
Ghrelin is a gastrointestinal hormone that acts in releasing growth hormone and influences the body general metabolism. It has been proposed as a candidate gene for traits such as growth, carcass quality, and milk production ...
Test-day model for milk yield of dairy buffaloes in colombia
(Livestock Research for Rural Development, 2011-07-01) [Artigo]
The test-day model is the preferred method for genetic evaluations in dairy cattle. For this study, 28372 test-day records of 1220 lactations from 1997 to 2009 were used. The (co)variance components for milk in test-day ...
Buffalo milk production in brazil and colombia: Genotype by environment interaction
(Livestock Research for Rural Development, 2011-07-01) [Artigo]
The objective of this study was to determine whether there is a genotype by environment interaction (GxE) for dairy buffaloes in Brazil and Colombia. The (co)variance components were estimated by using a bi-trait repeatability ...
Identification of polymorphisms in the osteopontin gene and their associations with certain semen production traits of water buffaloes in the Brazilian Amazon
(Reproduction in Domestic Animals, 2013-10-01) [Artigo]
Contents: The osteopontin gene may influence the fertility of water buffaloes because it is a protein present in sperm. The aim of this work was to identify polymorphisms in this gene and associate them with fertility ...
Factors that cause genotype by environment interaction and use of a multiple-trait herd-cluster model for milk yield of Holstein cattle from Brazil and Colombia
(Journal of Dairy Science, 2004-08-01) [Artigo]
Descriptive herd variables (DVHE) were used to explain genotype by environment interactions (G x E) for milk yield (MY) in Brazilian and Colombian production environments and to develop a herd-cluster model to estimate ...
Estudo de modelo alternativo para estimação de componentes de (co)variância e predição de valores genéticos de características de crescimento em bovinos da raça Nelore
(Arquivo Brasileiro de Medicina Veterinária e Zootecnia, 2002-02-01) [Artigo]
The objectives of this study were to estimate genetic parameters for non-standardized weights at nursing (PR120), at weaning (PR240), at yearling (PR365) and at post yearling (PR550), and to predict EPD's (expected progeny ...