Amino acid requirements of broiler breeders at peak production for egg mass, body weight, and fertility

Abstract

Two trials were conducted to determine the amino acid and protein requirements of broiler breeders at peak production. In trial 1, 32-wk-old Cobb 500 broiler breeders with similar BW were selected to determine the digestible amino acid requirement for daily product output (g of egg mass + g of BW gain/b/d) and feed conversion (g of feed/g of product) for Met, Phe, Arg, Ile, Lys, and CP in a 42-d production study. In trial 2, 30-wk-old Cobb 500 broiler breeders were selected to determine the digestible requirement for Met, Lys, Ile, Arg, Cys, Val, Trp, and Thr in a 70-d production study. Breeders were given a corn-soy basal diet plus crystalline amino acids with 8 graded levels of amino acids (10 birds per level), representing 40 to 130% of the highest suggested requirements reported in the literature. All other amino acids were maintained at 100% of their suggested requirement level. All breeders were inseminated weekly and fertility was determined. A third trial consisted of 41-wk-old colostomized hens randomly assigned to 1 of 2 diets differing only in the amount of Ile. Urine was collected after a 6-wk feeding period. The average digestible requirements per breeder per day for both product and feed/product ratio from trials 1 and 2 for Met, Cys, TSAA, Phe, Phe + Tyr, Trp, Arg, Ile, Lys, Val, Thr, and CP were 424, 477, 901, 689, 997, 252, 1,026, 830, 916, 799, 613 mg/d, and 20.0 g/d, respectively. The ideal profile for digestible Met, Cys, TSAA, Phe, Phe + Tyr, Trp, Arg, Ile, Lys, Val, and Thr was 46, 52, 98, 76, 108, 28, 112.0, 91, 100.0, 87, and 67%, respectively. A significant decrease in fertility was noted with increasing levels of Ile and Lys. Urine pH was significantly more alkaline in hens fed the higher level of Ile. It is suggested that adequate dietary Lys and Ile should be provided for maximum hatching egg production but an excess may affect fertility.

Feeding a Diet with Precise Lysine Level improved Laying Performance and Feed Efficiency of Broiler Breeder Hens at the Early Laying Stage

“…One thing we can see that the requirements determined for maximum productivity in the present study (average 925 mg) are considerably higher than those from previous researches. These results closely in accordance with recent results worked by Ekmay et al (2013), who Fig. 1.…”

Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks

“…It has been verified that the concentration of lysine in plasma can decrease with increase of dietary isoleucine concentration (Peganova & Eder, 2003). It is suggested that excess dietary isoleucine may affect fertility of broiler breeders (Ekmay et al, 2013) and that the digestible isoleucine:lysine ratio affects feed conversion and breast meat yield in broilers (Mejia et al, 2011). The studies on isoleucine requirement for broilers have been reviewed; however, there are limited recent studies assessing isoleucine requirements and isoleucine: lysine ratio for laying hens in the egg-laying phase.…”

The Nutritional Requirements of Protein for Sinai Cocks

“…Van Emous et al (2018) noted that during phase 1 (22: 34wks) and phase 2 (35: 46 wks) fertility and hatchability was not affected by reductions in dietary crude protein levels (13 to 11.5%). Some authors did not observe an effect of dietary protein levels on incubation traits (Mejia et al, 2012), although others showed that feeding poultry breeders a high protein levels during the laying period decreased fertility (Ekmay et al, 2013). Wilson et al (1988) showed no effect of feeding 9, 12 or 15% protein were observed on semen volume, concentration, number of spermatozoa ejaculated or spermatogenic activity.…”