evaluation of poultry litter on sorghum straw intake and dry matter disappearance using dry cows avaliação da cama de frango sobre o consumo e desaparecimento da matéria seca da palhada de sorgo em vacas secas

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ID: 205219
2005
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Abstract
An experiment was carried out to evaluate supplementation of sorghum straw (SS) with poultry litter (PL) in a single offering/day, and minerals and their effects on feed intake, sorghum straw dry matter disappearance (DMD) in nylon bags and rumen liquid ammonia N concentration. A 4x4 latin square design with 17-day periods and four rumen fistulated stalled cows was used to compare four treatments: (0) SS alone, (M) SS + mineral mixture offered ad libitum (P) SS + 1 kg/day of a concentrate with 83.5 % PL and (PM) SS + supplements used in M and P. The concentrate was offered in one meal and rumen N concentration increased to just over 100 mg/L between 1 and 3 h after feeding, decreasing to less than 50 mg/L after 7 h, levels similar to those on treatments without PL. Dry matter disappearance at 72 h and feed intake increased by the addition of concentrate, but not by mineral supplementation. These results show that the effect of supplementation with PL was due mainly to degradable nitrogen and not by the minerals. A single offering/day is not enough to maintain recommended ammonia N concentrations during most of the day.
Um experimento foi realizado para avaliar a suplementação de palhada de sorgo (PS) com cama de frango (CF), em oferta única, e com minerais, e seus efeitos sobre o consumo de ração, desaparecimento de matéria seca de PS (DMS), em sacos de nylon e a concentração de amônia no líquido ruminal. Quatro vacas confinadas e fistuladas no rúmen foram distribuídas em delineamento em quadrado latino 4x4, em período de avaliação de 17 dias, para comparar quatro tratamentos: (0) PS somente, (M) PS + mistura mineral ofertada ad libitum (P) PS + 1kg/dia de um concentrado contendo 83,5% de CF e (PM) PS + 1kg/dia de suplementos usados em M e P. O concentrado foi oferecido em uma única refeição e a concentração de N-NH3 do rúmen alcançando valores um pouco acima de 100 mg/L entre 1 e 3 horas após o consumo da CF, com valores menores que 50 mg/L depois de 7 horas, níveis similares àqueles em tratamentos sem CF. O DMS às 72 horas e consumo de ração foram aumentados com a inclusão de concentrado (P=0,0551), mas não com a suplementação por minerais. Os resultados obtidos indicam que o efeito da suplementação com CF deve-se, principalmente, ao nitrogênio degradável, e não aos minerais, e que uma alimentação por dia não é suficiente para manter a concentração de nitrogênio amoniacal no rúmen recomendada, durante a maior parte do dia.
Reference Key
zapata2005revistaevaluation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Ramón Álvarez Zapata;Jorge Combellas Láres
Journal european journal of lipid science and technology
Year 2005
DOI
10.1590/S1516-35982005000200028
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982005000200028
Keywords
calcium crude protein phosphorous

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