Heritability of Igf-i in Beef Cattle and Its Association with Growth and Carcase Traits
نویسندگان
چکیده
Plasma insulin-like growth factor-1 (IGF-I) concentration taken post weaning from 1240 Bos Taurus beef cattle were used to estimate the heritability of the trait and to investigate its genetic relationship with various growth and carcase traits. IGF-I had a heritability estimate of 32% and was positively genetically correlated with various measures of carcase fatness, both on the live animal (scanned rump and rib fat depth) and carcase (intramuscular fat % and P8 fat). Genetic correlations with weight traits (live weight and carcase weight) were close to zero (0.11 and –0.02, respectively) but slightly negative (-0.25) with finishing average daily gain. Opportunities exist to use this early life measure as a selection criterion for the genetic improvement of finishing growth rate and carcase fat traits.
منابع مشابه
Response to divergent selection for insulin-like growth factor-I concentration and correlated responses in growth traits in Angus cattle.
A divergent selection experiment for serum IGF-I concentration was established in 1989 at the Eastern Agricultural Research Station located in Belle Valley, Ohio. One hundred spring-calving (50 high line and 50 low line) and 100 fall-calving (50 high line and 50 low line) cows with unknown IGF-I concentrations were randomly assigned to the 2 divergent selection lines. Results of this study incl...
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