Genetic parameters and breed differences for feed efficiency, growth, and body composition traits of young beef bulls
نویسندگان
چکیده
منابع مشابه
Breed variation and genetic parameters for growth and body development in diverse beef cattle genotypes.
Conformation scores can account for more than 20% of cattle price variation at Australian livestock sales. However, there are limited available references which define genetic factors relating objective live developmental traits to carcass composition. Weaning and post-weaning weight, height, length, girth, muscle (ratio of stifle to hip width) and fat depth of 1202 progeny from mature Hereford...
متن کاملAge, season and breed effects on testicular volume and semen traits in young beef bulls.
A total of 218 yearling Hereford, Angus, Santa Gertrudis and Brahman bulls was evaluated for semen traits and testieular volume at average ages of 16 and 20 months in April and August, respectively, during 2 successive years. Brahman bulls reached puberty at a later age than bulls of the Santa Gertrudis, Hereford and Angus breeds. Santa Gertrudis bulls had the largest testes with the Brahman ha...
متن کاملGenetic parameters for fatty acid composition and feed efficiency traits in Japanese Black cattle.
We estimated the genetic parameters related to feed intake (FI), feed efficiency traits (including feed conversion ratio (FCR) and residual feed intake (RFI) of digestible crude protein (DCP) and total digestible nutrients (TDN)), beef marbling score (BMS), melting point of fat (MP) and fatty acid composition. Fat and meat (Musculus trapezius) samples were taken from the carcasses of 863 Japane...
متن کاملPhenotypic and genetic parameters for different measures of feed efficiency in different breeds of Irish performance-tested beef bulls.
No genetic parameters for performance and feed efficiency traits are available for Irish performance-tested bulls. The objective of this study was to determine the phenotypic and genetic variation for feed intake, BW, ADG, and measures of feed efficiency including feed conversion ratio (FCR), relative growth rate, Kleiber ratio, residual BW gain (RG), and residual feed intake (RFI). Observation...
متن کاملAssociations between feed efficiency, sexual maturity and fertility-related measures in young beef bulls.
The beef industry has emphasized the improvement of feed utilization, as measured by modeling feed intake through performance traits to calculate residual feed intake (RFI). Evidence supports an inverse relationship between feed efficiency and reproductive function. The objective of this study was to determine the relationship of reproductive assessments and RFI unadjusted (RFI(Koch)) or adjust...
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ژورنال
عنوان ژورنال: Canadian Journal of Animal Science
سال: 2004
ISSN: 0008-3984,1918-1825
DOI: 10.4141/a03-085