| Guanzhong black pig as a fine cultivated varieties in Shaanxi Province,with resistance to coarse feed,disease resistance and good flavor and good characteristics,but for many years without systematic breeding,the group has a certain degree of inbreeding,resulting in impuresical,Fecundity and other shortcomings.In recent years,people in the pursuit of high growth rate,high lean meat and low backfat thickness at the same time,resulting in pork quality declining.This study aims to study(1)the main economic traits of Guanzhong Black Pig,such as reproductive performance and growth and development performance.(2)Effects of diets with different nutrient levels on the performance,carcass traits,meat quality and meat quality related gene expression in Guanzhong black pig.So as to determine the optimal level of nutrition in Guanzhong black pig.(3)Guanzhong black pig sour meat gene and fluoride alkyl gene detection,the timely elimination of harmful pigs.and then lay the foundation for the next step in cultivating new strains of black pig in Guanzhong.The results of this experiment are as follows:1?The breeding performance of Guanzhong black pig was 9.94 ± 2.11,the number of live births was 9.40 ± 2.23,the primary weight was 1.13 ± 0.64 kg,the primary litter was 10.69 ± 3.59 kg,the weight of the nest was 31.06 ± 10.05 kg,Weaning weight 8.24 ± 1.40 kg,weaning weight 64.30 ± 15.82 kg.2?Guanzhong black pig growth traits: 2 months of age weight 15.79 ± 3.21 kg,4 months of age weight 44.92 ± 3.74 kg,6 months of age weight 75.14 ± 6.00 kg,4 months body height 44.99 ± 2.05 kg,body length 84.74 ± 2.20 cm,Leg hip 73.49 ± 3.75 cm,6 months body height 53.08 ± 2.28 cm,body length 100.84 ± 6.72 cm,leg hip 79.87 ± 2.18 cm,backfat thickness 8.00 ± 1.76 mm.3?The effect of nutrient level on the growth traits of the black pig during the fattening period: There was no significant difference in the initial weight of the four groups.For the whole fattening period,the fattening of the third group was 5.88 kg higher than that of the fourth group(P <0.01).The average daily gain of group 1 was 54.96 g / d higher than that in group 4(P <0.05),and there was no significant difference between group 1 and group 3(P> 0.05).The weight ratio of group 1 was lower than that of group 4(P <0.05).There was no significant difference between the weight ratio of group 1 and group 3(P> 0.05).4?The effect of nutrition level on the carcass quality of black pigs in Guanzhong: The slaughter rate increased by 3.11% compared with the fourth group,the difference was significant(P <0.05),the difference between the first group and the third group was not significant(P >0.05).5?Nutritional level on the quality of black meat in Guanzhong: Nutritional level of pork color score,marble score,pH no significant effect.Compared with the fourth group,the cooked meat rate increased by 9.58%,the difference was significant(P <0.05).The essential amino acid content of the third group increased by 1.80% and 1.89% respectively compared with the second group and the fourth group(P <0.01),and the difference was significant(P <0.05).Compared with the first group,the content of fresh amino acid was increased by 1.2%,and the difference was significant(P <0.05).6?Effects of Nutritional Levels on MyHC Gene Expression in Longest Muscles of Guanzhong Black Pig: The levels of MyHCIIx in Group 3 and Group 4 were significantly lower than those in Group 1(P <0.05).7?The genotype frequency of heterozygote of halothane gene was 7.69%,the frequency of HALN was 96.15%,and the frequency of HALn was 3.85%.8?The frequency of genotype of the heterozygote was 42.31%,the frequency of RN-was 21.15%,and the frequency of rn + was 78.85%.In summary,the breeding performance of Guanzhong black pig is slow and the growth rate is slow.The black pig population in this plant contains a certain degree of mutations in acid and mutton,and the potential harm of halothane gene is needed to eliminate the harmed herds in time.The health of the herd;Guanzhong black pig feeding the third group of nutrition level of the diet,can get better growth performance,better meat quality traits,and then can get the best feeding effect. |
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