@article{MAKHILLJAVA20087101419,
    title = {Effects of the Offspring’s Sex on Open Days in Dairy Cattle},
    journal = {Journal of Animal and Veterinary Advances},
    volume = {7},
    number = {10},
    pages = {1329-1331},
    year = {2008},
    issn = {1680-5593},
    doi = {javaa.2008.1329.1331},
    url = {https://makhillpublications.co/view-article.php?issn=1680-5593&doi=javaa.2008.1329.1331},
    author = {A. Cordova-Izquierdo,V.M. Xolalpa Campos,C. Gustavo Ruiz Lang,J.A. Saltijeral Oaxaca,S. Cortes Suarez,C.A. Cordova-Jimenez,M.S. Cordova-Jimenez,S.D. Pena Betancurt and},
    keywords = {Sex of the offspring,open days,dairy cattle},
    abstract = {With the purpose of determining the reproductive efficiency in a dairy farm, 412 registers of production were revised. The objective of this study was to value the effect of the sex of the calf on the open days up in a dairy farm. The study was carried out in a farm located in the municipality of Tizayuca, Hidalgo State, Mexico. The variables involved in this investigation are: number of childbirths, dates of childbirth, sex of the offspring and date of the service-conception. Of these the open days were obtained, with the objective to determine if the sex of the offspring influences in the open days. The registrations were divided in 2 groups (males and females), same that were subdivided in 6 groups by childbirth number. The analysis was carried out in Excel. The obtained results are the following ones: in general, the cows that birth males presented a smaller  period  of  open  days  (132.56 days)  that  those that birth females (143.69 days) with a difference of 11.13 days.}
    }