Dr. Rafael Amable Vásquez Martínez

IntroductionGenetic companies using new advances in genetic engineering are working to achieve high-persistence brown and white egg layer hybrids capable of producing more than 500 eggs in a 100-week lay and molt-free period.1-The quality of the shell is the main reason for a producer to discard a flock of layer.2-The posture drop is the second.- The most important nutritional strategy is bone hea ...

I. INTRODUCTIONCalcium and phosphorus are two minerals of great concern to poultry nutritionists as a result of the relatively large quantities needed in the diet, and the adverse effects on bone formation, shell quality, and overall performance when inadequate amounts of these minerals are supplied. It is further difficult to discuss calcium supply in poultry diets without referring to phosphorus ...

INTRODUCTIONUnder current production systems, turkeys have traditionally been protected from pathogenic microorganisms by vaccination and antibiotics. For decades, subtherapeutic doses of antibiotics have commonly been used within the poultry industry to improve production performance and reduce pathogenic microbial challenges. However, negative consumer perception and increased regulatory guidanc ...

INTRODUCTIONSoybean meal (Glycine max) is a widely used ingredient in livestock feed for its excellent protein content. Its production in Mexico is for use in the livestock industry, and is limited by the small scale of domestic soy bean production. Only 3 % of soybean meal demand is met by domestic production, the remaining 97 % coming from imported raw material(1). Despite its excellent protein ...

INTRODUCTIONVitamin D is a group of closely related compounds that have antirachitic activity. It has been estimated that nearly 50% of the United States population is at risk for vitamin D deficiency or insufficiency (Holick et al., 2011). Vitamin D3 (D3) deficiency can cause rickets in young children or increase the risk of osteoporosis and osteomalacia in adults (Holick, 2005). One approach to ...

Introduction:Due to the constant genetic evolution in both the production of broilers, nutritionists must constantly adapt their nutritional recommendations and feeding programs to maximize economic results at all times. These management and nutrition decisions must take into account: the animal (potential for growth), environmental conditions and the composition of the feed, which affect feed con ...