@article{MAKHILLJAVA20111022563,
    title = {Restricted Suckling and Hormonal Treatment on the Postpartum Ovarian Activity Resumption of Beef Cows in the Tropics of Mexico},
    journal = {Journal of Animal and Veterinary Advances},
    volume = {10},
    number = {2},
    pages = {195-199},
    year = {2011},
    issn = {1680-5593},
    doi = {javaa.2011.195.199},
    url = {https://makhillpublications.co/view-article.php?issn=1680-5593&doi=javaa.2011.195.199},
    author = {M.A.,J.C.,J.,J.,M.G.J. and},
    keywords = {resumption,GnRH,postpartum,Restricted suckling,progestogen,PGF2},
    abstract = {The aim of this study was determined the effect of suckling of the calf restricted to once a day per 30 min plus a combined hormonal treatment on the postpartum anestrous period and fertility in beef cows after 120 days postpartum. About 67 <I>Bos taurus</I> x <I>Bos indicus</I> crossbred multiparous pregnant cows were used and randomly distributed to five treatments: traditional suckling (TS; n = 15), calf stayed all day with the dam; restricted suckling (RS; n = 14), calf sucked the cow once a day per 30 min beginning day 7 postpartum; TS plus a combined hormonal treatment (TSH; n = 15), applied at day 50 postpartum, consisting in GnRH+Norgestomet for 7 days+PGF<SUB>2&#945;</SUB> (day 0)+GnRH (day 2); RS plus hormonal treatment (RSH; n = 16) as described in group 3 and without suckling (WS; n = 7) which included cows with death calves before day 7 postpartum. There was an increase (p&ge;0.001) in the ovarian activity of cows in the RS and RSH treatment compared to TS and TSH group cows (78.6 and 87.5 vs. 26.7 and 46.7%, respectively). Calving-first ovulation interval for WS cows was shorter (p&le;0.001) than intervals for RSH, RS, TSH and TS cows (22.3 vs. 49.3, 68.8, 63.5 and 86.3 days, respectively). Likewise, the calving-first ovulation interval was shorter for RSH (p&le;0.01) vs. TSH and TS. Cows in RS and RSH treatments were more fertile (p&le;0.001) than those from TS and TSH groups (42.3 and 56.3 vs. 20.0 and 6.6%, respectively). The WS cows (71.4%) had higher fertility (p&le;0.001) than cows from all other combined treatments (31.6%). No differences were found between treatments (p&gt;0.05) regarding the incidence of corpora lutea of short half-life. In conclusion, suckling restricted to 30 min reduced the resumption period of ovarian activity in beef cows in the tropics of Mexico. Double dose of GnRH plus Norgestomet and PGF<SUB>2&#945; </SUB>induced fertile ovulations after 50 days postpartum in restricted suckling cows.}
    }