000			03088nab a2200349 i 4500
003			BR-BrBNA
005			20250411132419.0
008			250411b2020 bl.ar|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aL51 _b6100
100			_aBarbosa, Silvana Alves Pedrozo Vitalino
100			_aCorrêa, Gerusa Silva Salles
100			_aCorrêa, André Brito
100			_aOliveira, Cleber Franklin Santos de
100			_aVieira, Bruno Serpa
100			_aFigueiredo, Érika Martins de
100			_aCaramori Júnior, João Garcia
100			_aLima Neto, Hélio Rezende
245			_aEffects of different proteases on commercial laying hens at peak production
500			_aPublicação on-line; 25 ref.; 5 tables; Sumaries (En)
520			_a ABSTRACT - We evaluated the effect of adding proteases in diets of laying hens at peak production on the performance, egg quality, relative weight of digestive organs, and intestinal morphometry. Hy-Line W36 layer hens (390; 28-39 weeks old) were distributed in five treatments, with 13 animals each, with six replicates. The treatments were: control (standard formulation without nutritional reduction or protease inclusion), negative control A - NCA (nutritional reduction according to protease A matrix, without protease), negative control B - NCB (nutritional reduction according to protease B matrix, without protease), NCA + protease A, and NCB + protease B. The experimental period lasted 12 weeks, divided into three cycles of 28 days. Hens subjected to treatments (NCA and NCB) showed a decrease in feed intake. However, the addition of proteases A and B promoted improvement in this trait. The diets NCA and NCB had a negative influence on the production rate of the hens, but the diet supplementation with protease B resulted in significant improvement on egg laying rate. Hens subjected to nutritional reduction presented the worst results regarding mass and conversion by egg mass. However, the addition of enzymes reversed these results. Although the diets did not affect the relative weights of yolk, albumen, eggshell, Haugh unit, and specific gravity of the eggs, a higher eggshell thickness was observed in hens that received NCA, NCB, and NCB + protease B diets. The diets did not influence the relative weights of digestive organs and the small intestine morphometry. Hens fed diets supplemented with A and B have performance recovered in relation to those that received diets with reduced levels of nutrients. Keywords: animal nutrition, egg laying, enzyme, laying hen, morphometry
650			_aGALINHA PARA POSTURA
650			_aNUTRIÇÃO ANIMAL
650			_aPROTEASE
650			_aOVO
650			_aQUALIDADE
650			_aCONVERSÃO ALIMENTAR
773	0		_03545 _9317600 _dViçosa-MG Sociedade Brasileira de Zootecnia 1997 _o2024-4310 _tRevista Brasileira de Zootecnia (Brazil) _x1516-3598 _gv. 49 p. 1-10 ; (2020) _wBR2024000569
856			_uhttps://www.scielo.br/j/rbz/a/HQNkxfQP8gMVvRcG4Cqdt6y/?format=pdf&lang=en
942			_cANA
999			_c330994 _d330994