Banca de DEFESA: GILIARDI ZANATTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GILIARDI ZANATTA
DATE: 25/11/2021
TIME: 13:30
LOCAL: Web Conferência - Google Meet - meet.google.com/kta-hyqu-dbw.
TITLE:

Identification of variables correlated to repeated estrous in dairy cattle from the northern region of the Rio Grande do Sul state.

KEY WORDS:

Zootechnical indexes, reproductive failure, repeated estrous.

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

The objective of this work was to collect data of variables regarding reproductive failure in dairy cattle in properties that technical assistance is provided. For this study, 53 dairy cattle with history of at least three repeated estrous were selected from farms located in the municipalities of Ametista do Sul, Alpestre and Planalto in the northern region of the Rio Grande do Sul State. These data were submitted to Spearman correlation and logistic regression, with calculation of odds ratio (OR) among three groups (primiparous, 2-3 lactations and ≥ 4 lactations) and between breeds (Holstein and Jersey). Significant differences (p≤0.05) were found between the variable placenta retention and use of prepartum diet, body weight, uterine infection, interval between estrous, and previous reproductive problems. Uterine infection also showed a strong correlation negative and positive with body weight and previous reproductive failure. Additionally, positive correlation was observed between winter season and number of repeated estrous, as well as winter and number of inseminations. Odds ratio demonstrated that cattle with ≥ 4 lactations have higher chances (98% e 87,5%) of developing a reproductive problem when compared to primiparous and cattle with 2-3 lactations, respectively. In conclusion, the analysed variables cited above possibly influence the occurrence of repeated estrous in dairy cattle and the increased numbers of lactations may directly enhance reproductive failures in the herd.

BANKING MEMBERS:
Externo à Instituição - CHESTER PATRIQUE BATISTA
Interno - 2648941 - IVAN BIANCHI
Presidente - 1081425 - TEANE MILAGRES AUGUSTO GOMES