The study aimed to determine the Xinjiang brown cattle＇s genetic param- eters of main growth and economic characters by using animal models and multiple traits derivative free restricted maximum likelihood （MTDFREML...The study aimed to determine the Xinjiang brown cattle＇s genetic param- eters of main growth and economic characters by using animal models and multiple traits derivative free restricted maximum likelihood （MTDFREML）. Results showed that： the heritability values of Xinjiang brown cattle＇s growth characters, including birth weight, 6-month-age weight, one full year weight and 2-year-old weight, were 0.45, 0.37, 0.38 and 0.34, respectively, which were medium level. The heritability values of body measurement indexes of different ages were different, indexes such as one-year-old weight, 2-year-old weight, body slanting length and body height had comparatively strong phenotypic correlation and genetic correlation. It was suggested that the breeding work of Xinjiang brown cattle should focus on selecting major breeding objectives like body height and body slanting length.展开更多
The live cattle eye muscle area, back-fat thickness, height of eye muscle and intramuscular fat content were determined by ultrasonic technology. The prediction model for meat production performance was established. T...The live cattle eye muscle area, back-fat thickness, height of eye muscle and intramuscular fat content were determined by ultrasonic technology. The prediction model for meat production performance was established. The numerical value had high reliability and accuracy, which reached extremely significant difference via analysis of variance. The study provides scientific basis for breeding and meat evaluation of beef cattle.展开更多
基金Supported by the Special Fund of Modern Agricultural Technology System Construction(nycytx-38)"National Science and Technology Support Program Project-Study on the Key Technology of Safe and High-efficient Production of Xinjiang Beef and Its Demonstration(2011BAD47B00)Science and Technology Major Project Research of Autonomous Region-Study and Demonstration on the Breeding of New Variety(Strain)of Xinjiang Beef and the Hybridization Improvement Technology"(Project Number:201230116-10)~~
文摘The study aimed to determine the Xinjiang brown cattle＇s genetic param- eters of main growth and economic characters by using animal models and multiple traits derivative free restricted maximum likelihood （MTDFREML）. Results showed that： the heritability values of Xinjiang brown cattle＇s growth characters, including birth weight, 6-month-age weight, one full year weight and 2-year-old weight, were 0.45, 0.37, 0.38 and 0.34, respectively, which were medium level. The heritability values of body measurement indexes of different ages were different, indexes such as one-year-old weight, 2-year-old weight, body slanting length and body height had comparatively strong phenotypic correlation and genetic correlation. It was suggested that the breeding work of Xinjiang brown cattle should focus on selecting major breeding objectives like body height and body slanting length.
基金Supported by Major Science and Technology Project of Xinjiang Uygur Autonomous Region(201230116-10)
文摘The live cattle eye muscle area, back-fat thickness, height of eye muscle and intramuscular fat content were determined by ultrasonic technology. The prediction model for meat production performance was established. The numerical value had high reliability and accuracy, which reached extremely significant difference via analysis of variance. The study provides scientific basis for breeding and meat evaluation of beef cattle.
