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Sulfate supplementation of growing goats: effects on performance, acid-base balance, and nutrient digestibilities.
Qi, K; Lu, C D; Owens, F N.
Afiliação
  • Qi K; E. (Kika) de la Garza Institute for Goat Research, Langston University, OK 73050.
J Anim Sci ; 71(6): 1579-87, 1993 Jun.
Article em En | MEDLINE | ID: mdl-8325819
ABSTRACT
Castrated male goat kids (20 Alpine, 12 Angora) were individually fed isonitrogenous and isoenergetic diets containing 2.28% N and S (added as CaSO4) at either .11 (basal), .20, .28, or .38% of dietary DM. Sulfate supplementation during the 8-wk growth trial quadratically increased ADG (P < .05) and tended to increase quadratically the DMI (P < .07) of goats, with a peak value for the .20% S diet. Even when analyzed using DMI as a covariate, ADG was quadratically increased (P < .05) by added S. Sulfate supplementation linearly increased (P < .001) S intake, fecal S output, and S retention. Sulfate supplementation tended to increase quadratically (P < .06) the blood plasma concentration of L-lactate. However, sulfate supplementation did not significantly affect (P > .10) plasma sulfate, plasma cystine, ruminal ammonia N concentrations, or purine N content of isolated ruminal bacteria. Sulfate supplementation quadratically increased (P < .05) fractional N retention. Urinary output of uric acid increased quadratically (P < .01) with S supplementation, presumably reflecting ruminal bacterial protein synthesis. Calculated by regression, the optimal dietary S content for maximum ADG was .22% S (NS = 10.41), for maximum DMI it was .24% S (NS = 9.5 1), for maximum N retention it was .23% (NS = 9.9 1), and for maximum absorbed N retained it was .22% (NS = 10.41). These results support the current estimate of the S requirement of goats for growth (NS = 101).
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Sulfatos / Equilíbrio Ácido-Base / Cabras / Aumento de Peso / Digestão Tipo de estudo: Diagnostic_studies Limite: Animals Idioma: En Revista: J Anim Sci Ano de publicação: 1993 Tipo de documento: Article
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Sulfatos / Equilíbrio Ácido-Base / Cabras / Aumento de Peso / Digestão Tipo de estudo: Diagnostic_studies Limite: Animals Idioma: En Revista: J Anim Sci Ano de publicação: 1993 Tipo de documento: Article