| In terms of breeding,the beef cattle industry developed countries mainly breed in one variety,beef cattle production performance continues to improve.The beef production in China is mainly based on the local yellow cattle and hybrid improved groups,and there is a lack of high-grade beef cattle breeds.Compared with developed countries,China’s beef cattle seed industry still has a gap.Good seed coverage is low,the average carcass weight,meat-production rate,ratio of high-grade beef than foreign specialized beef cattle breeds gap is larger,lack of specialized beef cattle breeds and our own brand.By introducing foreign varieties with local beef cattle breed cross-breeding,it is to develop new varieties breeding cattle and goods,as widely used as one of the important means.This experiment took Australian Wagyu and Yanbian yellow cattle hybrid cattle as the research object.The F1 and F2 hybrid cattle were selected to compare the growth performance and beef quality of the two.The aim was to breed high-end beef cattle breeds with proprietary intellectual property rights in my country.Produce high-end beef to promote the development of economic benefits.In the experiment,12 healthy uncastrated bull calves F1 and F2 each about 9months old were selected for a total of 24.F1 is group I and F2 is group II.There are3 repetitions in each group,and 4 cows in each repetition form a circle,which is divided into 6 circles.All test cattle were subjected to concentrated fattening test and slaughter test under the same feeding conditions,and the growth performance,slaughter performance and meat quality performance of F1 and F2 generation bulls were evaluated and analyzed.The test results are as follows:1.Production performance: During the test period,there was no significant difference in body weight and daily gain between the F1 and F2 generations of Australian Wagyu and Yanbian cattle crosses(P>0.05).The body measurement results show that the height and oblique length of the F2 generation are all smaller than those of the F1 generation.Although there are significant differences in the consumption of F1 and F2 between the ages of 10-13 months and 21-26 months,there is no difference in the feed-to-weight ratio.(P>0.05).2.Slaughter performance: There was no difference in live weight before slaughter between F1 and F2 generations.There was no significant difference in carcass weight,slaughter rate,net meat weight,net meat rate,eye muscle area,and carcass backfat thickness(P>0.05).There is no difference in fat color between F2 generation of Australian Wagyu and Yanbian yellow cattle crossed with F1 generation,but meat color,marble pattern and beef grade traits are better than F1 generation.There was no difference in the weight of the high-grade meat loin,outer spine,eye meat,upper brain,and high-quality meat between the cross-generation F1 and F2generations(P>0.05).3.Meat quality traits: Compared with the F1 generation cattle,the fat content,energy and protein content of the F2 generation cattle increased,but the difference was not significant(P>0.05),and the calcium and phosphorus content decreased,but the difference was also not significant.(P>0.05).The content of 16 amino acids in beef except arginine was significantly higher than that in F1 generation beef(P ≤0.05),and the content of the other 15 amino acids was extremely significantly higher than that in F1 generation beef(P ≤0.01).The essential amino acids is also significantly higher than that of F1 generation(P ≤0.01).UFA content,UFA/SFA in F2 generation beef is extremely significantly higher than F1 generation(P ≤0.01),while SFA content,PUFA content,PUFA/UFA content,and PUFA/UFA are extremely significantly lower than F1 generation(P ≤0.01).The zinc content of the F2 generation beef of Australian Wagyu and Yanbian cattle crosses were significantly higher than that of the F1 generation(P ≤0.05).There was no difference in energy,protein,fat,iron,selenium,and cobalt content between F1 generation and F2 generation beef(P>0.05). |
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