Genetic change results from selection on an economic breeding objective in beef cattle1
نویسندگان
چکیده
منابع مشابه
Genetic change results from selection on an economic breeding objective in beef cattle.
The objective of this study was to evaluate and quantify the genetic progress achieved in a New Zealand Angus nucleus herd through long-term selection for an economically based, multi-trait breeding objective. A 4-trait breeding objective was implemented in 1976 and selected on through 1993 with traits consisting of slaughter weight and dressing percentage of harvest progeny and cull cows, and ...
متن کاملMultistage selection for maximum economic return with an application to beef cattle breeding.
Methodology for selection index updating was developed to allow multistage selection. The program determines truncation points for each stage of selection that will maximize either profit or the ratio of aggregate economic gain to cost (R = delta H/C). Either maximum profit or R may be attained by reducing the cost of performance testing in later stages of a multistage program. In order to elim...
متن کاملBreeding and Genetics: Genomic Selection in Beef
314 Genomic divergence of indicine and taurine cattle identified through high-density SNP genotyping. L. R. Porto-Neto2, T. S. Sonstegard*1, G. Liu1, D. Bickhart3, C. Gondro6, M. V. da Silva4, Y. T. Utsunomiya5, J. F. Garcia5, and C. P. Van Tassell1, 1USDA, ARS, Bovine Functional Genomics Laboratory, Beltsville, MD, 2University of Queensland, Gatton, Queensland, Australia, 3USDA, ARS, Animal Im...
متن کاملGenetic partitioning of variation in ovulatory follicle size and probability of pregnancy in beef cattle1
The objectives of this research were to partition variation in ovulatory follicle size into genetic and nongenetic components and to assess the utility of ovulatory follicle size as an indicator trait associated with reproductive success in beef cattle. Data were collected during the years 2002 to 2005 from 780 beef females that ranged in age from 1 to 12 yr (mean of 2.4 observations per female...
متن کامل1 Breeding History of Japanese Beef Cattle and Preservation of Genetic Resources as Economic Farm Animals
INTRODUCTION Modern beef cattle used for our beef production are not exactly a property left by our ancestors, but composed products from native and imported cattle. Most native cattle were graded up by British and continental breeds for a few generations about 90 years ago. It should be pointed out, however, that they are the sole domestic farm animals in our country contributing to practical ...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 2008
ISSN: 0021-8812,1525-3163
DOI: 10.2527/jas.2006-566