Relación entre celo-inseminación con semen sexado y porcentaje de pre:fiez en vaquillonas Holstein

Marini, P. R.; Galassi, I.
May 2011
Revista Veterinaria;2011, Vol. 22 Issue 1, p52
Academic Journal
The aim of this work was the study of the relationship between the length of the period passed from the estrus detection to the insemination with sex- sorted semen and the conception rate in dairy heifers, and whether this relationship (if there is one) is affected by the origin of the semen (bull effect). In a retrospective study, information gathered during 2009 on 607 estrus- service periods, corresponding to 607 Holstein heifers, was assessed. For the services carried out during the period under analysis, semen from five bulls was used. Observations on estrus and inseminations were registered four times a day. Based on this information, heifers were sorted out according to the interval (in hours) between the estrus detection and their insem ination in four groups: 9:00- 10:59, 11:00- 12:59, 13:00- 14:59 and 15:00- 17:00 hours. There were no significant differences (p>0.05) between the different groups and the conception rate. The bull effect did mark significant differences (p<0.05) within the conception rate. It is concluded that no negative impact was observed on the conception rate in inseminations made among the studied intervals after the estrus initiation in dairy heifers, but significative differences was observed when considering the type of bull.


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