TY  - JOUR
T1  - Effects of the Offspring’s Sex on Open Days in Dairy Cattle
AU - , A. Cordova-Izquierdo AU - , V.M. Xolalpa Campos AU - , C. Gustavo Ruiz Lang AU - , J.A. Saltijeral Oaxaca AU - , S. Cortes Suarez AU - , C.A. Cordova-Jimenez AU - , M.S. Cordova-Jimenez AU - , S.D. Pena Betancurt AU - , J.E. Guerra Liera 
JO  - Journal of Animal and Veterinary Advances
VL  - 7
IS  - 10
SP  - 1329
EP  - 1331
PY  - 2008
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2008.1329.1331
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2008.1329.1331
KW  - Sex of the offspring
KW  -open days
KW  -dairy cattle
AB  - 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.
ER  -