Efeito da base genética materna e da estação de parição sobre variáveis produtivas de fêmeas primíparas Holandês x Zebu Effect of the maternal genetic basis and of the calving season on productive variables of primiparous Holstein x Zebu cows

Abstract

Avaliaram-se variáveis produtivas de 78 fêmeas primíparas mestiças de base genética materna Gir ou Guzerá, paridas na estação seca ou chuvosa, utilizando-se o procedimento GLM do SAS. A estação de parição interferiu (PProductive variables of 78 crossbred Holstein x Zebu primiparous cows of Gir or Guzera maternal genetic basis, calved in the dry or rainy season were evaluated using the GLM procedure of the SAS. The calving season affected the weight at calving (WC), body condition score at calving (BCS), service period (SP) and calving interval (CI). The WC and BCS were higher (P<0.05) por cows calved in the dry season, 475.19±39.81kg and 4.07±0.44, than in the rainy season, 420.67±37.80kg and 3.62±0.37, respectively. The SP and CI were shorter (P<0.05) for cows calved in the dry season, 132.02±91.94 days and 13.90±3.06 months, than cows calved in the rainy season, 190.07±77.27 days e 15.84±2.58 months, respectively. The Gir based cows had higher milk yield, longer lactation period and higher milk yield per day of calving interval than the Guzera based cows, respectively, 2276.15±656.47kg, 306.08±46.55 days, 5.06±1.38kg/day for the Gir and 1733.74±678.41kg, 265.62±67.11 days, 4.37±1.68kg/day for the Guzera based cows.

Keywords

• gado leiteiro
• Hostein x Zebu
• produção de leite
• eficiência reprodutiva
• base genética
• estação de parição
• dairy cattle
• Holstein x Zebu
• milk yield
• reproductive traits
• genetic basis
• season calving