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Physiological parameters for thermal stress in dairy cattle. The objective of this study was to investigate changes in physiological parameters of dairy cows and understand which physiological parameters show greater reliability for verification of heat stress.... ... Repositório: BDPA Ano de publicação: 2016
Genomic selection in multi-breed dairy cattle populations. Abstract Genomic selection has been a valuable tool for increasing the rate of genetic improvement in purebred dairy cattle populations. However, there also are many large populations of crossbred dai... ... Repositório: BDPA Ano de publicação: 2016
Leptospirosis in dairy cattle from Southern Brazil: risk factors. Cattle are susceptible to chronic leptospirosis infection, that results in reduced milk production and reproductive disorders such as abortions, stillbirths, fetal malformation, and mummified fetuses,... ... Repositório: BDPA Ano de publicação: 2022
Copy number variation in dairy cattle using next-generation sequencing. Gene copy number variants (CNV) have been shown to be associated with several production traits in dairy cattle; however, the detection and validation of CNVs in crossbred cattle is currently lacking.... ... Repositório: BDPA Ano de publicação: 2018
Effect of pregnancy on the genetic evaluation of dairy cattle. We investigated the effect of stage of pregnancy on estimates of breeding values for milk yield and milk persistency in Gyr and Holstein dairy cattle in Brazil. Test-day milk yield records were analyz... ... Repositório: BDPA Ano de publicação: 2011
Ruminal methane emission by dairy cattle in Southeast Brazil. Ruminal gases, particularly methane, generated during the fermentative process in rumen, represent a partial loss of feed energy and are also pointed to as an important factors in greenhouse effect. T... ... Repositório: BDPA Ano de publicação: 2009
Ruminal methane emission by dairy cattle in southeast Brazil. ABSTRACT: Ruminal gases, particularly methane, generated during the fermentative process in rumen, represent a partial loss of feed energy and are also pointed to as an important factors in greenhouse... ... Repositório: BDPA Ano de publicação: 2009
Evaluation of Vegetation Indices at Pasture-Based Systems for Dairy Cattle using Remote Sensing Data. Our objective in this study was to evaluate the effect of two dairy-cattle production systems on the Normalized Difference Vegetation Index (NDVI) of the pasture, obtained from a temporal series of La... ... Repositório: BDPA Ano de publicação: 2016
Genetic parameters for milk production traits and breeding goals for Gir dairy cattle in Brazil. The present study defined breeding goals and proposed selection indices for milk production and quality traits of Gir dairy cattle. The results indicate that milk component traits should be included i... ... Repositório: BDPA Ano de publicação: 2015
Quantitative trait loci affecting lactose and total solids on chromosome 6 in Brazilian Gir dairy cattle. Fourteen Brazilian Gir sire families with 657 daughters were analyzed for quantitative trait loci (QTL) on chromosome 6 affecting lactose and total solids. Cows and sires were genotyped with 27 micros... ... Repositório: BDPA Ano de publicação: 2011

Mostrando 1 - 10 de 547 resultados.

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