Puberdade em novilhas da raça Crioula Lageana / Puberty in Crioula Lageana heifers

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Age of puberty was evaluated in heifers (Crioula Lageana Breed) submitted to two post-weaning feeding systems, in the Santa Catarina Plateaus, Brazil. This work was composed by two treatments: Treatment I, 9 animals were maintained in cultivated pasture during the winter; and Treatment II, 9 animals were maintained in natural pastures during the whole period of the experiment. In both treatments, animals received mineral supplementation. Daily observations of estrus behavior were made. All animals were submitted to rectal palpation, ultra-sonography, blood samples were taken weekly and all animals were weight monthly. Puberty was characterized by the first estrus, with or without oestrus behavior, confirmed by the formation of the corpus luteum and plasmatic concentrations of progesterone by radioimmunoassay (RIA) over 1 ng/mL, in two consecutive samples. Age of puberty measured in months and weight of puberty measured in kilograms were evaluated statistically with variance analysis and the means obtained between treatments I and II, were compared to each other by "Student" t test, at the significance level P_0,05. Mineral supplementation with cultivated pastures in the winter for Crioula Lageana heifers after weaning advanced their ages of puberty. The results showed that the animals with 15 months of age and with approximately 300 kg are able to reproduction.

ASSUNTO(S)

animal reproduction reproducao animal reprodução animal heifers novilho

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