Características produtivas da lactação de quatro grupos genéticos F1 Holandês x Zebu

We studied the lactation of F1 Holstein x Gir, Holstein x Guzerat, Holstein x Azebuado and Holstein x Nellore cows in nine calving orders from two daily milkings.The average daily production, the lactation peak, the day when the peak occurred and the ratio of production in the first and in the second daily milking were analyzed.In the production system, in which the animals were raised, Brachiaria decumbens and Brachiaria brizanta grazing were used as roughage in the rainy season, and corn silage or cane sugar as supplement in the dry season.The concentrate ration was supplied in accordance with the production.It was observed that all of the evaluated traits were directly influenced by the calving order and maternal basis.Amongst the findings, it is outstood that, the average daily milk production of F1 Holstein x Gir and Holstein x Azebuado cows were higher and similar between them while F1 Holstein x Guzerat and Holstein x Nellore cows presented lower productions and they were also similar between them.It is concluded that all of the genotypes groups can be used for the milk production because presenting average daily production higher than 10 kg/cow/day, being compatible with milk production in pasture.