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- W3043325114 abstract "During the last decades, the milk production per cow has increased while fertility and mounting behavior have decreased in Holstein cows. Voluntarily delaying rebreeding to a period where the cow is in positive energy balance might help improving pregnancy rates. To overcome the problems associated with estrus detection, the use of a double artificial insemination (AI) technique, where cows are inseminated 1 or 2 days apart, have previously been applied but with inconsistent results. The two main objectives of the present study were: (1) to determine if the pregnancy rates were improved when delaying rebreeding to 8 months after calving compared with cows inseminated at around 2 months after calving; and (2) to evaluate the effect of a double AI technique around estrus on the pregnancy rates compared with the use of a single AI per estrus. The dataset comprised 235 observations, each representing one AI, from 62 cows followed for consecutive lactations of 10 months (early rebreeding at 2 months) and one lactation of 16 months (late rebreeding at 8 months). The double AI technique was applied in 41% of the AI recorded. The results showed that even though more cows tended to express mounting behavior at the late rebreeding compared with the early rebreeding (63.3 vs 45.9% respectively, P=0.06), the pregnancy rate at first AI was not improved (40.0 vs 38.7% respectively, P=0.27). The cows receiving the double AI technique had a lower pregnancy rate compared with the cows receiving a single AI per estrus (45.8 vs 63.8 respectively, P<0.01). Moreover, use of the double AI technique induced confusion as how to report the reproductive performance in the herd, taking into account the total number of insemination/success or considering only one value per estrus. To conclude, delaying rebreeding to 8 months increased mounting behavior at AI time, but did not increase pregnancy rate at first AI. The double insemination technique had a negative effect on the pregnancy rate at first AI." @default.
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- W3043325114 date "2016-08-28" @default.
- W3043325114 modified "2023-09-23" @default.
- W3043325114 title "Voluntarily delayed rebreeding and double insemination effects on pregnancy rates of Holstein cows" @default.
- W3043325114 hasPublicationYear "2016" @default.
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