Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/18754
Tipo: Artigo
Título: Net requirements of calcium, phosphorus, magnesium, and sulphur for growth of non-descript breed hair lambs of different sex classes in the Brazilian semiarid conditions
Autor(es): Silva, Ivonete Ferreira da
Rodrigues, Rafael Torres de Souza
Queiroz, Mário Adriano Ávila
Chizzotti, Mario Luiz
Zanetti, Marcus Antonio
Cunha, José Aparecido da
Busato, Karina Costa
Abstract: The aim of this study was to determine the net requirements of calcium (Ca), phosphorus (P), magnesium (Mg), and sulphur (S) for weight gain of non-descript breed hair lambs (NDBL) of different sex classes reared under Brazilian semiarid conditions. Sixty NDBL (20 intact males, 20 castrated males, and 20 females), with an average initial body weight of 18.1 ± 0.4 kg and average age of 5 months were used. The macromineral requirements were determined by the differences in body composition through comparative slaughter direct method. The animals were confined for 58 days, and the average fasting body weight (FBW) and average daily gain (ADG) of lambs fed ad libitum were 29.2 ± 0.6 and 0.19 ± 0.01 kg, respectively. The net requirements of macrominerals for gain of NDBL did not differ between sex classes (P > 0.05), and ranged from 1.83 to 1.46 g/day of Ca, 1.21 to 1.01 g/day of P, 37 to 30 mg/day of Mg, and 0.31 to 0.28 g/day of S, for lambs with an ADG of 0.200 kg and 15 or 30 kg of FBW, respectively (P < 0.05). The N to S net ratio reduced and increased, respectively, as the body weight and ADG increase. The net requirements of Ca, P, Mg, and S for gain of NDBL slaughtered young and at the same age did not differ between sex classes and decreased as the body weight increased. The net requirements for gain of Ca and P were similar to those recommended by NRC (2007).
Palavras-chave: Gender
Mineral
Nutrient balance
Semiarid
Sheep
Editor: Tropical Animal Health and Production
Tipo de Acesso: Springer Science+Business Media Dordrecht
URI: https://doi.org/10.1007/s11250-016-1035-4
http://www.locus.ufv.br/handle/123456789/18754
Data do documento: 11-Mar-2016
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