The objective of this study was to investigate the influence of ambient temperatures on carcass characteristics of lambs fed concentrate diets with or without NaHCO3 supplementation. A slaughter study was carried on 12 male Black Belly Barbados lambs randomly drawn from a growth trial (35 weeks). The lambs were divided into four equal groups and allotted in a 2×2 factorial design. The lambs were allotted at random to two dietary treatments of a basal diet (35:65 roughage:concentrate) or basal diet supplemented with 4% NaHCO3 at different ambient temperatures (20°C and 30°C) in an environment controlled chamber for 10 days. Lambs were slaughtered for carcass evaluation at about 262 days of age (245 days of growth trial, 7 days adaptation and 10 days of experimental period). Ambient temperature had significant (p<0.05, p<0.05, p<0.01, and p<0.001) effects on meat color from the ribeye area (REA), fat, leg and longissimus dorsi muscles with higher values recorded for lambs in the lower temperature group than those from the higher ambient temperature group. Significant differences (p<0.05) in shear force value (kg/cm2) recorded on the leg muscles showed higher values (5.32 vs 4.16) in lambs under the lower ambient temperature group compared to the other group. Dietary treatments had significant (p<0.01, p<0.01, and p<0.05) effects on meat color from the REA, fat, and REA fat depth (cm2) with higher values recorded for lambs in the NaHCO3 supplementation group than the non supplemented group. Similarly, dietary treatments had significant differences (p<0.05) in shear force value (kg/cm2) of the leg muscles with the NaHCO3 groups recording higher (5.30 vs 4.60) values than those from the other group. Neither ambient temperature nor dietary treatments had any significant (p>0.05) effects on pH, and water holding capacity on both muscles. These results indicated that NaHCO3 supplementation at low ambient temperatures had caused an increase in carcass characteristics leading to significant effect on meat quality.

Twenty male Barbados lambs (3 months old) were used to evaluate the effects of sodium bicarbonate (NaHCO 3 ) supplementation on growth performance and carcass characteristics of lambs fed concentrate diets in controlled-environment chambers set at 20 °C and 30 °C. In the 35-week-long growth trial, the animals were divided into 4 groups (n = 5) and fed 2 dietary treatments: a basal diet (35:65 roughage and concentrate) or a basal diet supplemented with 4% NaHCO 3 . Twelve lambs randomly selected from this trial were arranged in a 2 × 2 factorial design for a 10-day-long slaughter and carcass evaluation experiment. Lambs in the 20 °C ambient temperature group had higher (P < 0.001) feed intake (FI, g day -1 ) and body weights (P < 0.01) than those of the other group. The NaHCO 3 -supplemented group had higher (P < 0.05) FI g day -1 and average daily gain (ADG, kg -1 ) (P < 0.01) than the other group. The 30 °C ambient temperature affected half carcass weights, body lengths, and bone lengths (P < 0.05, P < 0.01, and P < 0.01, respectively). In conclusion, incorporation of NaHCO 3 to concentrate diets at a 20 °C ambient temperature increased FI g day -1 and ADG kg -1 , resulting in improved growth performance of the lambs.

No abstract

No abstract