We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Effect of feed restriction with or without betaine supplementation on immune response, blood cation-anion balance, body temperature and bone characteristics of broiler chickens under heat stress.
- Authors
Maddahian, A.; Morovat, M.; Dadvar, P.; Bafti, M. Shamsaddini
- Abstract
This experiment was conducted to determine the effects of feed restriction and betaine supplementation on immune response, blood cation-anion balance, bone characteristics and body temperature of broiler chickens under heat stress. A total of 160 one-day old chicks (Ross 308) in a 2x2 factorial experiment within a completely randomized design were divided into 4 treatments with 4 replicates in each. The treatments included two levels of feed restriction (none and 80% of ad libitum diet from day 7 to day 21) and two levels of dietary betaine (0 and 1 g/kg). The results indicated that betaine supplementation had no effects on antibody titer against Newcastle disease vaccine, but it caused an increase in bursa (P<0.01) and spleen (P<0.05) weights, as well as the antibody titer against Infectious bursal disease (P<0.05). Feed restriction levels had no effects on immune responses of broilers. Using betaine caused blood cation-anion balance to decrease significantly (P<0.01). Blood cation-anion balance was also decreased at day 42 by feed restriction (P<0.05). Only on day 14 of age and under stress, feed restriction caused a meaningful reduction (P<0.01) in cloacal temperature, but no significant difference was observed at days 21 and 28. Betaine supplementation reduced the cloacal temperature under heat stress at days 14 and 21 (P<0.01) and day 28 (P<0.05), but there was not any meaningful differences before heat stress at these days. Feed restriction led to a decrease in tibia length of broilers at days 28 (P<0.01) and 42 (P<0.05). Tibia ash showed no significant difference among treatments, but betaine supplementation increased tibia length (P<0.01) and tibia ash percentage (P<0.05). Interaction between these factors indicated that supplementing betaine and applying feed restriction together can be used as management strategy against heat stress.
- Subjects
BETAINE; IMMUNE response; IMMUNOLOGY; BODY temperature; BROILER chicken diseases; THERAPEUTICS
- Publication
Journal of Livestock Science, 2017, Vol 8, p179
- ISSN
2277-6214
- Publication type
Article