Gomez S.,National Institute of Research in Forestry |
Gomez S.,National Autonomous University of Mexico |
de Lourdes Angeles M.,National Institute of Research in Forestry
International Journal of Poultry Science | Year: 2011
An experiment was carried out to evaluate the relationship of an Enzymatically Hydrolyzed Yeast (EHY) and yeast culture combined with flavomycin and monensin (F + M) under two levels of Digestible Lysine (DLYS) on the growth performance, carcass measurements, nutrient retention and AMEn in broilers. One hundred and thirty two 35 d old Ross B308 male broilers individually housed in holding cages were used. Broilers were assigned to a factorial arrangement of 2 levels of EHY (0 and 1 kg/ton of feed) x 2 levels of F + M (0.0 and 0.05,0.50 kg/ton) x 2 DLYS levels (0.85 and 0.95%). The experiment lasted 2 wks. Results were subjected to analysis of varianza. EHY-fed broilers showed a trend for greater (p<0.10) feed intake, had improved (p<0.05) weight gain, feed conversion ratio and had greater (p<0.01) weight and yield of the carcass, breast and legs. Broilers fed EHY and 0.95% DLYS had higher nitrogen intake and retention and lower AMEn than those with 0.85% DLYS (EHY and DLYS interaction, p<0.05). EHY-fed broilers also had greater dry matter and ashes intake (p<0.01) and retention (p<0.05). The addition of F+M to the diet improved the weight gain (p<0.05), feed conversion ratio (p<0.01), nitrogen retention and AMEn (p<0.05). Broilers fed the 0.95% DLYS diet had greater feed conversion (p<0.05). The addition of EHY and F+M improved the production and nutrient use in broilers but their effects were independent. The EHY and DLYS showed an additive or synergistic relationship on the nitrogen intake and retention and AMEn. © Asian Network for Scientific Information, 2011.
Gomez R.S.,National Institute of Research in Forestry |
Gomez R.S.,National Autonomous University of Mexico |
Angeles M.L.,National Institute of Research in Forestry
Revista Brasileira de Ciencia Avicola | Year: 2016
Two experiments were done to evaluate the effect of increasing levels of dietary digestible methionine (Met) and Met:cysteine (Met:Cys) ratio on the productivity of Hy-Line W-36 laying hens fed sorghum- and soybean meal-based diets. In Exp. 1, 160 hens from 68 to 75 weeks of age were assigned to four dietary levels of digestible Met (0.20 0.24, 0.28 and 0.32%). The digestible total sulfur amino acids:Lysine (TSAA:Lys) ratios were: 62, 68, 76 and 84%. In Exp. 2, 192 hens from 76-83 weeks of age were assigned to four dietary digestible Met:Cys ratios (160, 116.7, 85.7 and 62.5%). The digestible TSAA:Lys ratio was kept constant across diets (80%). Results were subjected to ANOVA and linear regression analyses. In Exp. 1, optimal egg production, egg mass, and feed efficiency responses were observed at 0.30 and 0.50% of dietary digestible Met and TSAA, respectively (quadratic effect, p<0.05). Live performance was maximized with digestible Met and TSAA in takes of 288 and 478 mg/hen/d, respectively. In Exp. 2, optimal egg production and feed efficiency responses were observed at 151 and 150% of dietary digestible Met:Cys ratios, respectively (quadratic effect, p<0.05). The digestible Met, Cys and TSAA intake to maximize egg production and feed efficiency were 313, 207 and 510 mg/hen/d, respectively. The requirements for sulfur AA in Hy-Line W-36 hens from 68 to 83 weeks of age fed sorghum- and soybean meal-based diets fell inside the range of the requirements previously estimated in hens fed corn-soybean meal based diets. © 2016, Fundacao APINCO de Ciencia e Tecnologia Avicolas. All rights reserved.
Gomez-Rosales S.,National Institute of Research in Forestry |
Gomez-Rosales S.,National Autonomous University of Mexico |
De L Angeles M.,National Institute of Research in Forestry
Asian-Australasian Journal of Animal Sciences | Year: 2015
The objective of this research was to evaluate the growth performance, the apparent ileal digestibility of nitrogen and energy, the retention of nutrients and the apparent metabolizable energy corrected to zero nitrogen retention (AMEn) in broiler chickens supplemented with increasing doses of a worm leachate (WL) as a source of humic substances (HS) in the drinking water. In Exp. 1, 140 male broilers were penned individually and assigned to four WL levels (0%, 10%, 20%, and 30%) mixed in the drinking water from 21 to 49 days of age. Water was offered in plastic bottles tied to the cage. In Exp. 2, 600 male broilers from 21 to 49 days of age housed in floor pens were assigned to three levels of WL (0%, 10%, and 20%) mixed in the drinking water. The WL was mixed with tap water in plastic containers connected by plastic tubing to bell drinkers. The results of both experiments were subjected to analysis of variance and polynomial contrasts. In Exp. 1, the daily water consumption was similar among treatments but the consumption of humic, fulvic, and total humic acids increased linearly (p<0.01) as the WL increased in the drinking water. The feed conversion (p<0.01) and the ileal digestibility of energy, the excretion of dry matter and energy, the retention of dry matter, ash and nitrogen and the AMEn showed quadratic responses (p<0.05) relative to the WL levels in drinking water. In Exp. 2, the increasing level of WL in the drinking water had quadratic effects on the final body weight, daily weight gain and feed conversion ratio (p<0.05). The addition of WL as a source of HS in the drinking water had beneficial effects on the growth performance, ileal digestibility of energy, the retention of nutrients as well on the AMEn in broiler chickens; the best results were observed when the WL was mixed at levels of 20% to 30% in the drinking water. Copyright © 2015 by Asian-Australasian Journal of Animal Sciences