Synchronization of Estrus in Sheep in Different Seasons

[Objectives] The aim was to improve and stabilize the estrus synchronization of local sheep in Xinjiang during the breeding season and non-breeding season. [Methods]The data of estrus rate and estrus concentration time were analyzed by different hormone treatment programs. [Results]eding season,whether PMSC was used did not affect the estrus of sheep when sponge and PG were used（ P 〉 0. 05）. Estrus was concentrated in 36-48 h after sponge plugs were removed,and the estrus rate in this period accounted for 74. 19% of the total. In non-breeding season,the estrus rate in the sponge plug plus PGF treatment was only56. 12%,significantly lower than that（ 90. 43%） in the sponge plug plus PG plus PMSG treatment（ P 〈 0. 01）. The estrus was also concentrated in 36-48 h after sponge plugs were removed. The estrus rate at this stage was 67. 42%,accounting for 82. 8% of the total. In breeding season,the estrus rate in sheep injected with333 IU of PMSG（ 81. 96%） was significantly lower than those of sheep injected with 500（ 90. 25%） and 750 IU（ 95. 3%）（ P 〈 0. 05）. [Conclusions] This study provides a theoretical basis for the production enterprises to save a lot of manpower and material resources.

Management Practice and Comparison of Reproductive and Productive Performance of Dairy Cattle between Beneficiary and None Beneficiary of Estrus Synchronization and Mass Insemination in North Shewa Zone,Amhara Region,Ethiopia

The aim of this study was to assess the overall management practice and comparison of reproductive and productive performance between beneficiaries and none beneficiaries of oestrus synchronization and mass insemination(OSMI)of dairy cattle in north shewa zone of dairy cattle.Data were obtained by interviewing 270 estrus synchronization and mass insemination beneficiaries and 135 none beneficiaries’dairy farmers.Data were analyzed using Statistical Packaging for social science(SPSS)version 20.Natural pasture and crop residue were the most common feed resources in the study areas.River water was the major source of water for their cattle and well water was used when river water is not available.In their order of importance;FMD,mastitis,and abortion were the major diseases of cattle in the study area.The reproductive performance of dairy cows in OSMI beneficiaries were age at first service(30.81±7.6),calving interval(6.9±5.2),lactation length(8.95±2.46),day open(5.3±3.18)and number of service per conception(1.5±0.38)whereas in none beneficiary age at first service(32.88±6.64),calving interval(18.18±5.8),lactation length(9.6±0.54),day open(5.17±3.43)and number of service per conception(1.22±0.54)months.There was a significant(p<0.05)difference in milk yield between beneficiaries and none beneficiaries in HFC,HHFC and JERC dairy cows per day per cow.The major factors affecting reproductive performance of dairy cows are management,nutritional status,genotype,and disease.Therefor the productive and reproductive performance of the dairy cows reared by the participants were better than those of the nonparticipants.

Application of Artificial Insemination in Selective Breeding of Native Beef Cattle in Wenzhou

[Objective]The paper was to improve the quality and growth rate of native yellow cattle in Wenzhou.[Method]Three groups of cattle were subjected to artificial insemination using frozen semen from Wagyu bull.The groups consisted of 20 native yellow cattle,20 Angus catle,and 20 Luxi yellow cattle.The heifers were subsequently evaluated for body size and body weight,and underwent treatment with estrus synchronization,artificial insemination,and early pregnancy diagnosis.[Result]The mean body size and body weight of native yellow cattle were found to be significantly lower than those of Angus cattle and Luxi yellow cattle(P<0.05).The estrus synchronization rate and mating rate of native yellow cattle were both 100%,while the corresponding rates for Angus cattle and Luxi yellow cattle were 90%and 95%,respectively.The ultrasound examination conducted on the 32m day following the mating revealed a distinct image of gestation sac,which,when considered alongside the findings of the rectal examination,may be indicative of pregnancy.The conception rates were 75%,72%,and 74%for native yllow cattle,Angus cattle,and Luxi yellow cattle,respectively.[Conclusion]The reproductive performance of native beef cattle is relatively superior.