Desempenho produtivo e reprodutivo de fêmeas 1/2 Holandês x Nelogir

Abstract

This work aimed to evaluate the total milk production, milk production to 90 and 180 days of lactation, daily average production, production per day of calving interval, lactation length, days open and calving interval of 1/2 Holstein x Nelogir females. That crossing came as alternative to increasing demand of dairy F1 matrices. The analyzed data were proceeding from the Calciolândia farm, located in Arcos–MG. They were evaluated effects of order and season of calving, of the Gir sire and Holstein sire, grandfathers and parents of 1/2 Holstein x Nelogir matrices, respectively. The calving season was divided into season 1 (November to January), season 2 (February to April), season 3 (May to July) and season 4 (August to October). The sires were classified in accordance with the PTA for milk getting three groups for Gir sire (superior, inferior and animal without progeny test) and two groups for the Holstein breed (positive and negative). The means were esteemed by minimum squares and compared by the SNK test to 5% of significance. It was made analysis of regression of milk production per day of lactation in accordance with the calving order. The total milk production, with average lactation length of 288 days, was of 3426.9 kg of milk that surpasses in 2.7 times the national average. The calving order influenced the daily average production that was greater in the second calving and the persistence of lactation that was superior in the animals of first calving. The period of rains beginning (November to January) presented minor lactation length and production per day of calving interval. The total milk production did not vary in accordance with the Gir sire used and the milk production was superior in the matrices children of Holstein sires of positive PTA for milk. The behavior of the lactation curve in the first calving presented standard format with peak of production of 13.03 kg to 45 days of lactation while in the second calving, was decreasing since the calving. In tropical conditions 1/2 Holstein x Nelogir matrices presented good productive and reproductive capacity evidencing a maternal base promising for production of F1 females.