2018
DOI: 10.1111/jpn.13021
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Optimal in‐feed amino acid ratio for laying hens based on deletion method

Abstract: A total of 56 Hy‐line W‐36 hens from 28 to 30 weeks were used on nitrogen balance (NB) trial to estimate daily N maintenance requirements (NMR) and the genetic potential for daily N retention (NRmaxT). The treatments consisted of six graded levels of nitrogen in the diets (N1 = 8; N2 = 16; N3 = 24; N4 = 32; N5 = 40; and N6 = 48 g N/kg of feed), formulated using the dilution technique. The regression analyses between nitrogen intake and excretion were performed to fit the exponential function and to determine t… Show more

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Cited by 10 publications
(9 citation statements)
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“…It is intimated that the protein requirements of modern genotypes have increased because they have a higher EO [ 12 , 13 , 14 , 15 , 16 ]. Modern laying genotypes have a lower BW with a reduced EW [ 2 ].…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…It is intimated that the protein requirements of modern genotypes have increased because they have a higher EO [ 12 , 13 , 14 , 15 , 16 ]. Modern laying genotypes have a lower BW with a reduced EW [ 2 ].…”
Section: Discussionmentioning
confidence: 99%
“…Some comparative work on evolving broiler genotypes’ growth and nutrient requirements has been published [ 10 , 11 ], but similar studies do not appear to exist for laying hens. It is intimated that the nutrient requirements of modern genotypes have increased [ 12 , 13 , 14 , 15 ]. Kidd and Loar [ 16 ] point out that the rate of change in the egg industry is such that it exceeds the science required from research to support emerging management practices.…”
Section: Introductionmentioning
confidence: 99%
“…The ideal amino acid ratio as determined by the Goettingen approach was lysine, 100; isoleucine, 75; and valine, 90. As determined by the Louvain approach, it was lysine, 100; isoleucine, 80; and valine, 91 (Soares et al, 2018) [ 22 ].…”
Section: Introductionmentioning
confidence: 99%
“…To meet this increasing demand, the performance of laying hens has been improved by genetic selection breeding programs coupled with better nutritional strategies. Amino acid requirements for laying hens were published in NRC (1994) and a number of relevant investigations have been subsequently reported ( Schutte et al, 1994 ; Ishibashi et al, 1998 ; Coon and Zhang, 1999 ; Harms and Russell, 2001 ; Faria et al, 2003 ; Leeson and Summers, 2005 ; Bregendahl et al, 2008 ; Lemme, 2009 ; Soares et al, 2019 ). However, amino acid requirements for brown layers have not been updated for nearly a decade and it is important to redetermine requirements for optimal production efficiency, welfare, and health, especially during the peak production period.…”
Section: Introductionmentioning
confidence: 99%