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Articles by A. Corzo
Total Records ( 3 ) for A. Corzo
  A. Corzo , W.A. Dozier, III , M.T. Kidd and D. Hoehler
  Two experiments were conducted to evaluate the importance of Ile as a limiting amino acid in diets fed to broilers up to heavy market weights (35-54 d). The first experiment compared a control diet formulated to meet all critical limiting amino acids vs. a diet that also met all limiting amino acid needs except for Ile (0.71 vs. 0.58% standardized ileal digestibility). Results from Experiment 1 showed poorer BW gain, feed conversion and feed cost/BW gain in birds fed the Ile-marginal diet when compared to the control. Experiment 2 evaluated the supplementation of three graded levels of Ile (0.58, 0.62 and 0.66% standardized ileal digestibility) to the Ile-reduced diet used in Experiment 1. Results for Experiment 2 showed that BW gain and feed conversion improved when L-Ile was supplemented to the lowest dietary Ile level fed. Supplementation with equal amounts of Arg did not alleviate the dietary Ile limitation, thus validating the essentiality and marginality of Ile in practical corn-soybean meal diets when at least 2% of meat-and-bone meal is present in diet formulation.
  C.N. Obi , H.M. Parker , A. Corzo and C.D. McDaniel
  Because research revealing the impact of Lys on reproduction in Broiler Breeders (BB) is sparse, this study was conducted to evaluate the impact of digestible Lys (dLys) on BB semen characteristics and BW. Eighty males were caged individually from 20 to 39 wk of age. Treatment 1 and 2 diets had the same level of dLys (1,000 mg/rooster/day) in a corn-soybean meal based diet (Soy 1000) and distillers dried grains with solubles (DDGS; DDGS 1000) diet, respectively. Treatment 3, 4 and 5 diets had the inclusion of DDGS in order to titrate dLys intake levels of 850 (DDGS850), 700 (DDGS700) and 550 (DDGS550) mg/rooster/day, respectively. Body weight and semen samples were determined every 2 wk from 26 to 38 wk of age. Immediately after semen collection, samples were analyzed for semen volume, sperm viability, sperm concentration and the Sperm Quality Index (SQI). BW of roosters fed Soy 1,000 was higher than the other treatments from wk 26 through wk 38. This excess weight could be due to over estimating the energy content of DDGS resulting in diets that were not isocaloric. At 28 wk and continuing through wk 38, the percentage of dead sperm was highest in roosters fed Soy 1000. Also, at wk 38 plasma testosterone concentrations were higher for roosters fed Soy 1000. In conclusion, varying levels of dLys (1,000-550 mg/rooster/day) in a DDGS based diet does not appear to cause adverse effects on BB male semen quality during pre-peak and peak production.
  S. Cerrate and A. Corzo
  Background and Objective: It seems that current broiler chickens have modified the dietary nutrient needs and body composition over time. Further, the relationships between dietary nutrients and feed cost or biological nutrient requirements are unknown. The aim of this study was to understand and explain current energy and amino acid tendencies of dietary levels and requirements, to evaluate relationships between dietary energy and lysine among levels, feed cost and requirements and to compare energy and lysine efficiency from 2001-2017. Methodology: Data from literature were evaluated to predict the dietary ME and amino acids as well as the body fat content by multiple regression. Actual dietary ME and digestible lysine levels were linearly regressed with diet cost and ME and lysine requirements. Efficiencies of lysine and ME were calculated taking into account the broiler genetic improvement through body composition. Results: Dietary energy levels have been reduced at a rate of 5 kcal per year while digestible lysine has increased by 0.009% per year from 2001-2017. Nutritionists during the process of selecting dietary energy and lysine levels have been influenced by feed cost (r2 = 0.75) and lysine requirements (r2 = 0.86), respectively. During a period of 16 years, modern broiler chickens deposit less body fat (-6% of body weight) and more body protein (+4% of body weight) and convert energy and amino acids into meat more efficiently than older broiler genotypes. Conclusion: These data indicate that dietary energy and lysine are reduced and increased, respectively, influenced by feed cost and requirements, resulting in better energy and lysine efficiencies due to feed intake and body composition changes.
 
 
 
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