Effect of supplementation of phytogenic feed additives on intake, in vitro fermentation, growth performance and carcass traits in weaned Barbari kids reared under intensive feeding.

Twenty-four weaned male Barbari kids (age 144.67 days; weight 11.99 ± 0.49 kg) were divided equally into three groups (T ₁ , T ₂ , and T ₃ ) in order to investigate the effect of supplementation of phytogenic feed additives (herbal mixture) in the complete pelleted feed on growth performance, in vitro rumen fermentation and carcass quality in kids reared under stall-fed condition. Treatment groups were as follows: T ₁ , concentrate mixture (40%) plus arhar (Cajanus cajan) straw (60%) in total mixed ration (TMR) form fed ad libitum; T ₂ , T ₁ diet in complete feed pellets form fed ad libitum; and T ₃ , T ₁ diet in complete feed pellets form supplemented with herbal mixture (Tulsi/Haldi/Amla/Arni; ratio 1:1:1:1 on DM basis) at 0.5% in complete feed fed ad libitum. The experimental kids in each group were allowed for feeding for 8 months by following the respective feeding schedule. Rumen fermentation pattern under in vitro system was also studied using the same three diets as substrates. After 240 days of feeding, all goats were slaughtered following standard protocol. Total body weight gain (kg) and average daily gain (ADG, g/day/kid) were 18.57, 22.26, and 23.06 kg, and 79.91, 101.49, and 100.18 g in T ₁ , T ₂ , and T ₃ treatments, respectively. Pelleting of TMR (T ₂ ) and supplementation of herbal mixture in pelleted feed (T ₃ ) increased (P < 0.001) average daily weight gain in Barbari kids compared to T ₁ (TMR). Average dry matter intake (DMI, g/day/kid) during growth trial was greater (P < 0.05) in T ₃ (1079.17) than T ₁ (849.76) and T ₂ (968.76). Feed conversion efficiency was 8.92, 9.48, and 8.68% in T ₁ , T ₂ , and T ₃ , respectively. The difference was statistically non-significant among the treatments. Supplementation of herbal mixture in the complete pelleted substrate had adjunct effect on improvement of TCA-precipitable-N and total VFAs in the incubation medium under in vitro system. Carcass weight (kg) tended to increase in finisher kids under T ₂ (16.58) and T ₃ (16.70) than T ₁ (14.61), but the variation was non-significant. The dressing percentage was similar among three treatments. Similarly, the muscle protein, fat, and cholesterol contents remained unaffected by different dietary treatments. Therefore, it may be concluded that densification of feeds in the form of complete pelleted feed and further supplementation with potential phytogenic feed additives increased total DMI and ADG and tended to enhance meat production potential in finisher Barbari kids without changing the meat chemical composition.
(© 2022. The Author(s), under exclusive licence to Springer Nature B.V.)