Studies On The Program Artificial Insemination In Yellow Cattles

Program Artificial Insemination is an important technique in the industrialized production of yellow cattle. However, previous reports showed that the offioioncy of synchronization would be different due to the situation of the recipients as well as other natural environment The reproductive performance of yellow cattle after estrus ovulation synchronization and fixed-time Al was compared with Al cattle after ostrus synchronization in natural local yellow cattle.53 healthy and illness yellow cattle were assigned randomly to four treatment groups in this experiment. Group I (OvSynch): GnRH+PGF25+GnRH, Group II: GnRH+PGF2€k+EB, Group Ill:PRID+ PGFk+EB, and the control group ~F~+PGF~. After 16?0h 24h 24h fixed-time Al followed the treatments in group L II mid III. The results were as follow.(1)No significant difference was observed between the experiment groups arid the control group for the rate of synchronized estrus(PX).OS). But the rates of ostrus following the treatments in 24h were respectively 85.7%~ 60.0% 85.7% in group I II and III, while estrus in the control group wasnt centralization and lasted for 4days.(2)Al respectively finished after l6?3h~24.-28h24-28h for all the cattle in group Ill and Ill. However Al were made during the time of 30?8h~ 48?2h~ 72?6h after the treatment for I~ 3 and 3 cattle respectively in the control group.(3)The conception rate of group ill and Ill were respectively 60.O%~ 58.3%~ 57.1%. There was no difference(P>O.05) in the conception rate between three experimental treatments and the control trcatmcnts(42.9%).This study demonstrates, that fixed-time Al can get good reproductive performance after the treatment for the local yellow cattle utilizing the program of OvSynch GnRH+PGF2a-i-EB and PRID+PGF~+EB. Especially the program GnRH+PGF2~l-EB was adequate to widely apply for production for its low cost and pretty effect...