Amino Acid Supplementation Strategies In Low-Protein Diets For Broiler Chickens

Abstract

180-day-old broiler chicks obtained from a commercial hatchery in Hyderabad.Group A is basal diet 21% protein without amino acid supplementation Group B: basal diet 21% protein+ low amino acid supplementation. Group C: 19% protein with medium amino acid supplementation. Group D: 17% protein high amino acid supplementation. Growth performance and nutrient digestibility data were collected. Analyzed using JMP software from SAS, USA. Group B higher live body weight (2235.67±12.09 g/b).Feed intake was highest in Group A. Best feed conversion ratio (FCR) observed in Group B Dressing percentage: Group A > Group B > Group D > Group C.Relative weight of liver and heart was significantly different among the groups. While relative weight of proventriculus, spleen and intestine were non-significantly different among the groups. Leg, femur, breast, drumstick, and wing weight were also non-significantly different among the groups. Regarding nutrients digestibility indicated that significantly higher dry matter digestibility was recorded in group B (22.51±0.78%) followed by D (20.41±0.22%), C (19.21±0.12%) and A (18.95±0.52%). Maximum (P> 0.05) ash digestibility was determined in group C (88.23±0.05%) followed by D (86.36±0.20%), B (85.36±0.32%) and A (93.33±0.15%). Significantly higher crude fiber digestibility was recorded in group B (69.49±0.12%) followed by A (58±0.25%), C (50.09±0.20%) and D (41.89±0.18%). Significantly higher fat digestibility was determined in group D (51.06±0.16%) followed by B (49.39±0.29%), A (49.26±0.25%) and C (44.56±0.16%).Significantly higher crude protein digestibility was determined in group A (60.39±0.35%) followed by C (56.23±0.07%), D (54.64±0.13%) and B (54.19±0.38%). Mortality percentage in group A, B, C and D was recorded as 3%, 2%, 2% and 2%, respectively. Increased Live Body Weight Group B (fed the basal diet with low amino acid) showed significantly higher live body weight compared to other groups. Improved Feed Efficiency The feed conversion ratio (FCR) was best in Group B. Dressing Percentage Group A had the highest dressing percentage followed by Group B, D, and C.