%0 Journal Article
%T Eventos reproductivos de vacas con diferente porcentaje de genes Bos taurus en el tr¨®pico mexicano
%A L¨®pez Ordaz
%A Rufino
%A D¨ªaz Hern¨¢ndez
%A Mario
%A Garc¨ªa Mu£¿iz
%A Jos¨¦ Guadalupe
%A N¨²£¿ez Dom¨ªnguez
%A Rafael
%A L¨®pez Ordaz
%A Reyes
%A Mart¨ªnez Hern¨¢ndez
%A Pedro Arturo
%J Revista mexicana de ciencias pecuarias
%D 2010
%I Instituto Nacional de Investigaciones Forestales, Agr¨ªcolas y Pecuarias
%X the objective of the present study was to determine the best possible percentage of bos taurus (bt) genes on age-at-first-calving (afc), days to first post-partum service (dfps), days open (do) and calving interval (ci) in crossbred cows. data was collected in a typical commercial dairy farm of tabasco on 1,704 full lactations (270-d) from 677 cows ranging between 100 % bos taurus (bt) and 100 % bos indicus (bi). data analysis was carried out through a mixed model which included the following unchanging effects: calving number, calving year and season and the random effects of sire, cow within sire, with bt gene percentage effect as covariable. fourth calving cows showed a lower dfps (p<0.05) than second and third calving animals and these were different to primiparous. correspondingly, second or more calving cows showed shorter do and ci (p<0.05) than first calving cows. afc was shortest in 49 % bt genes, increasing to 36 mo as this percentage increased. cows having 100 % bi genes showed 106 d dfps, 166 d do and 14.6 mo ci, all of them shorter than in crossbred cows. as a conclusion, it can be stated that cows having 50 % bt genes show longer dfps, do and ci and shorter afc, therefore being the best genotype for dairy herds in the humid tropics.
%K crossbreeding
%K tropical bovines
%K reproductive performance.
%U http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S2007-11242010000400002&lng=en&nrm=iso&tlng=en