Fertility Programs to Achieve High 21-d Pregnancy Rates in High-Producing Dairy Herds
نویسندگان
چکیده
Hormonal synchroniza on protocols have been incorporated widely into reproduc ve management programs by dairy farmers (Caraviello et al., 2006; Norman et al., 2009). The ini al impact of TAI protocols on 21-day pregnancy rates in U.S. dairy herds has been to increase the AI service rate (Norman et al., 2009); however, a deeper understanding of the physiology underlying the Ovsynch protocol has allowed for a drama c increase in fer lity to med ar fi cial insemina on (TAI). As the tle of this paper suggests, perhaps it is now more appropriate to refer to the latest itera on of hormonal synchroniza on protocols as fer lity programs for lacta ng dairy cows.
منابع مشابه
Estrous Synchronization Programs for Dairy Cows and Heifers
Introduction: Although milk production as measured by rolling herd averages has increased markedly for dairy herds in the Western United States over the last decade, reproductive performance of these herds has declined significantly. Average days open have increased by 25 days and fertility has declined as measured by an increase of 0.37 services per conception and first service conception rate...
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