العوامل المؤثرة في عدد التلقيحات اللازمة للإخصاب الواحد عند بقر الهولشتاين في الساحل السوري

Abstract EN

This study was conducted at Fedio Dairy Station using 2189 records for 790 Holstein cattle to study the effect of frozen–thawed bull semen, inseminator, calving year (CY), calving season (CS) and parity (P) on the number of services per conception (S/C).

Data were obtained between the period 2003 and 2013 and evaluated according to GLM procedure (SAS 9).

Analysis of variance was used to determine the effect of studied factors on S/C, and Duncan test was used to compare means.

Results revealed that the overall mean for (S/C) was 2.61±0.04 and affected significantly (0.01>P) by frozen–thawed bull semen and (0.05>P) by inseminator.

However, there were no significant effects for Y, S and P on S/C.

It was concluded that accuracy in detecting estrus cycle, using high semen quality for artificial insemination, insemination on the proper time and efficiency of inseminator could increase fertility rate and reduce number of S/C at Fedio station