Analysis of Physiological Function Changes and Breeding Effects of Jersey Bulls Introduced into Pastoral Areas

Abstract:

In this paper, in order to fully understand the adaptability and physiological function changes of Jersey bulls in alpine pastoral areas, we introduced 6monthold Jersey bulls into pasture areas to observe the changes in physiological functions, and then mated with yaks naturally after they matured. This study compared the reproductive performance of yaks under natural mating and artificial insemination. The results showed that the conception rate, calving survival rate, and reproductive rate of female yaks under natural mating methods were 19.26%, 25.71%, and 23.12% higher than those of female yaks using artificial insemination technology, and the abortion rate and newborn calf mortality rate were higher than those of female yaks using artificial insemination technology. Female yaks with artificial insemination techniques were 8.54 and 5.64 percentage points lower, respectively. At the same time, this paper conducts a comparative analysis of calf production performance on the offspring Jersey females produced by yaks under the two hybridization techniques. The results showed that the natural mating female yaks produced offspring Jersey female calves had higher birth weight, 12monthold body weight, firstborn colostrum volume, and firstborn average annual lactation volume than those of artificially inseminated female yak calves. 4.92 kg, 21.86 kg, 0.36 kg, 197.89 kg. The data of the two groups were tested for significant difference. The birth weight, 12monthold body weight, and annual average lactation volume of the firstborn calves in the natural mating group were significantly higher than those in the artificial insemination group (P< 0.01), while the difference in the amount of firstborn colostrum was significant (P< 0.05).