Open AccessInteração entre fatores ambientais, saúde, eficiência produtiva e reprodutiva de vacas holandesas em free stall
Author(s) -
Leidiane Gonçalves Fernandes
Publication year - 2021
Publication title -
principia/revista principia
Language(s) - English
Resource type - Journals
eISSN - 2447-9187
pISSN - 1517-0306
DOI - 10.18265/1517-0306a2020v1n53p190-205
Subject(s) - zoology , artificial insemination , ice calving , insemination , heat index , biology , lactation , pregnancy , pregnancy rate , heat stress , genetics
The objective of this study was to evaluate the interaction of environmental factorsin calving and first artificial insemination, uterine and udder health, productive and reproductive efficiency of lactating Holstein cows in free stall. Ideagri® and Dairy Plan® software were used to collect dataof production, reproduction and health data of 321 lactating cows.ADAMA Clima® software provided temperature and relative humidity data to calculate the temperature and humidity index. Environmental variables were evaluated as for season by means of analysis of variance (ANOVA) and means compared by the Kruskal-Wallis test. The effects of the birth season and artificial insemination on the 60th-day pregnancy rate were assessed by logistic regression in the Software R “aod” package, the differences between the average pregnancy rates of each season were determined by the Chi-test Square. Pregnancy rate at the 60th day after the first postpartum artificial insemination was positively influenced on the fourth lactation, and negatively by the occurrence of placental retention during the warm seasons in which the artificial insemination was performed. The placental retention and artificial insemination season with temperature and humidity index>80 interfered with reproductive efficiency.