title: Strategies of supplementation of female suckling calves and nutrition parameters of beef cows on tropical pasture.
abstract: The performance of female calves in creep feeding under different strategies of supplementation and milk production, intake, and digestibility of grazing Nellore and crossbred cows (Nellore × Holstein) during the dry-rainy transition season were assessed. Forty-four female beef suckling calves, with initial age between 90 and 150 days and average initial body weight of 117.7 ± 4.3 kg, and their respective dams (24 Nellore and 20 crossbred) with average initial body weight of 417.5 ± 8.3 kg, were used. The experimental treatments consisted of: control group--mineral mixture only; strategy 1--supplementation from 112 days prior to weaning (0.375 kg/animal/day); strategy 2--supplementation from 112 days prior to weaning, in increasing amounts of 0.15, 0.30, 0.45, and 0.60 kg/animal/day through the four experimental periods, respectively; and strategy 3--supplementation from 56 days prior to weaning (0.750 kg/animal/day). Calves from strategy 1 had greater (P < 0.05) average daily gain (0.672 kg/day) than control animals (0.582 kg/day) and greater (P < 0.05) efficiency of supplement use than the other groups. Crossbred cows produced more milk than Nellore cows (P < 0.05). Crossbred cows presented greater (P < 0.05) dry matter intake (DMI) than Nellore cows. However, no differences were found (P > 0.05) for nutrient digestibility among genetic types. It can be concluded that strategies of supplementation that present an equitable distribution of supplement provides greater weight gain in suckling female beef calves. Crossbred cows produce more milk and present greater DMI than Nellore cows. There are no differences in the nutrient digestibility between Nellore and Nellore × Holstein crossbred cows.
authors.affiliation: Departamento de Zootecnia, Universidade Federal de Viçosa (UFV), 36571-000, Viçosa, Minas Gerais, Brazil. eritonvalente@yahoo.com.br
authors.forename: Eriton Egidio Lisboa
authors.initials: EE
authors.lastname: Valente
authors.forename: Mario Fonseca
authors.initials: MF
authors.lastname: Paulino
authors.forename: Edenio
authors.initials: E
authors.lastname: Detmann
authors.forename: Sebastião de Campos
authors.initials: Sde C
authors.lastname: Valadares Filho
authors.forename: Livia Vieira
authors.initials: LV
authors.lastname: Barros
authors.forename: Carla Heloisa Avelino
authors.initials: CH
authors.lastname: Cabral
authors.forename: Aline Gomes
authors.initials: AG
authors.lastname: Silva
authors.forename: Marcio de Souza
authors.initials: Mde S
authors.lastname: Duarte
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001938:Brazil; D002417:Cattle / Q000254:growth & development / Q000502:physiology*; D003433:Crosses, Genetic; D019587:Dietary Supplements / Q000032:analysis*; D004063:Digestion; D005247:Feeding Behavior; D005260:Female; D007774:Lactation; D008892:Milk / Q000378:metabolism; D009753:Nutritive Value; D012621:Seasons; D014329:Tropical Climate; D015430:Weight Gain