Effect of different reproductive biotechnologies (AI, ET-in vivo and ET-in vitro) on reproductive performance of Holstein females

• Grant number: 18/05780-8
• Support Opportunities: Scholarships in Brazil - Master
• Start date: June 01, 2018
• End date: January 31, 2019
• Field of knowledge: Agronomical Sciences - Veterinary Medicine - Animal Reproduction
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Pietro Sampaio Baruselli
• Grantee: Mariana Pallú Viziack
• Host Institution: Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Reproductive biotechniques such as AI, ET-in vivo and ET-in vitro have been applied as a management strategy aiming a greater productivity and reproductive efficiency in Brazilian and worldwide cattle breeding. However, there are differences in the reproductive efficiency of these biotechnologies that compromise the productive and reproductive performance of the herds. Thus, the objective of this project is to evaluate the effect of the different biotechnologies (IA, TE-in vivo and TE-in vitro) on the reproductive performance of Holstein cows, and to evaluate the reproductive and productive performance of their progeny. The study will be conducted at Fazenda Santa Rita/Agrindus S.A. located in Descalvado-SP. The data on lactating cows that received the three biotechnologies will be analyzed contemporaneously from 2013 to 2015. The following variables will be analyzed in the progenitors: conception rate at 30 and 60 days, birth rate, gestational loss rate between 30 and 60 days and between 60 days and birth, and abortion rate. In addition, the variables duration of gestation, ease of delivery and retention of fetal attachments will be evaluated in the progenitors. Subsequently, they will be evaluated in their progeny birth weight, weight at weaning, age at first conception and milk production at the first and second lactations. The data will be analyzed by the PROC GENMOD and PROC GLIMMIX SAS. (AU)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

VIZIACK, Mariana Pallú. Effect of different reproductive biotechnologies (AI, in vivo ET and in vitro ET) on productive and reproductive performance of Holstein females. 2020. Master's Dissertation - Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) São Paulo.