Vol. 11, Special Issue 1 (2022)

Author(s):
D Rambabu, V Ravinder Reddy, SV Rama Rao, J Narasimha and M Shashi Kumar

Abstract:
The first two tests were done at the same time to see how digestible Lysine (Trial - I) and digestible TSAA (Trial - II) affected performance, immunological competence, and livability in commercial broilers. The 6-week growth studies on broilers were designed using 650 one-day-old commercial male broiler chicks in a fully randomised design (CRD) (VenCobb). The chicks were divided into thirteen treatments at random, each with ten duplicates of five chicks. Initially, different amounts of lysine and TSAA (Meth+Cys) were tested while maintaining the appropriate ME and CP for commercial broilers (Cobb 400). Performance, immunological response, and livability are among the response criteria. During the pre-starter period, the group given NRC levels of (1.10 percent lysine and 0.90 percent TSAA) had the lowest body weight increase of all the dietary groups. During the starter, finisher, and overall experimental periods, however, variations in dietary amounts of NRC and Cobb prescribed lysine and TSAA had no significant effect on body weight. Similarly, no significant differences in feed intake or feed efficiency were detected in commercial broilers over the research period related to dietary lysine and TSAA levels. The relative weight of bursa was considerably improved (P0.05) when the content of digestible lysine and TSAA was increased. Treatment group T3 had a considerably (P0.05) larger weight of bursa than the other treatment groups due to a higher dietary concentration of Cobb recommended digestible lysine (1.18 percent) and TSAA (0.880 percent). The weight of the bursa was recorded at the highest concentration of Cobb suggested lysine (100%) and the lowest concentration of Cobb recommended TSAA (110%). The weight of spleen in broilers was not affected by the NRC and Cobb approved concentrations of digestible lysine and TSAA in corn-soybean meal diets. The fluctuation in digestible lysine and TSAA concentrations in corn-soybean meal diets had no significant effect on humoral immunity as measured by antibody titers against NDV at the 28th and 42nd days. The dietary content of digestible lysine and TSAA in diets had no effect on cell mediated immunity as measured by CMI response to PHA-P injection at 24 hours after inoculation. Variations in digestible lysine and TSAA concentrations in broiler diets had little effect on livability.