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Layer Performance Recovery After Feeding Amino Acid-deficient Diets

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Author(s): Faria DE | Harms RH | Russell GB

Journal: Revista Brasileira de Ciência Avícola
ISSN 1516-635X

Volume: 4;
Issue: 2;
Start page: 141;
Date: 2002;
Original page

Keywords: amino acid deficiency | egg production | laying hens | threonine

ABSTRACT
Three hundred and twenty Hy-Line W36Ò commercial laying hens, 39 weeks of age, were used to determine the sequence and the length of time needed for hens to recover performance characteristics after an eight-week period under graded levels of threonine deficiency. Eight experimental diets with Thr levels ranging from 0.35 to 0.53% were randomly fed with eight replicates of five hens each. After the previous experiment, the hens were fed a control diet (0.53% Thr) for a four-week period. Feed consumption (FC), energy intake (EI), egg production (EP), egg weight (EW), egg mass (EM), and body weight (BW) were evaluated. All performance characteristics were impaired on Thr deficient diets. The recovery sequence order was FC and EI; EP, EW and EM, and finally BW, with the length of time of two, three, and four weeks, respectively. The data indicated that an amino acid deficiency does not cause permanent damage to the reproductive system of the hens.
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