caa a22 4500 397568851 CHVBK 20180308164835.0 cr unu---uuuuu 161202e199608 xx s 000 0 eng 10.3382/ps.0750991 doi (NATIONALLICENCE)oxford-10.3382/ps.0750991 Examination of the Dietary Methionine Requirements of Breeding Northern Bobwhite, Colinus virginianus [Elektronische Daten] [C. B. DABBERT, R. L. LOCHMILLER, P. W. WALDROUP, R. G. TEETER] Adult Northern bobwhite were used to test the hypothesis that dietary methionine levels recommended by the NRC for breeding quail are excessive for wild bobwhite. We tested the hypothesis by comparing immunocompetence, reproductive performance, and chick viability of Northern bobwhite hens fed diets containing low (0.31%), moderate (0.39%), or high (0.47%) concentrations of methionine. Chick viability was determined by assessing immunocompetence, including evaluating the ability of hens to passively transfer immunity to their chicks. Hens were fed the experimental diets for 6 wk on an ad libitum basis. After 6 wk, methionine treatment had no measurable effect (P ≥ 0.20) on hen phytohemagglutinin wing web indices, organ weights, or serum anti-Pasteurella multocida titer indices. Mean egg weight, percentage egg production, total cumulative egg production, yolk weight, yolk volume, and percentage fertile and percentage hatch of fertile eggs did not differ (P ≥ 0.12) among diet treatments. Amount of albumen in eggs produced by hens fed the high methionine diet averaged 0.27 g more (P = 0.003) than eggs of hens fed the low methionine diet. Anti-P. multocida titer of yolks from eggs in Week 6 were not different (P = 0.36) between birds fed the high and the low methionine diets. The mortality rate of chicks after challenge with 23 cfu of P. multocida was not different (P ≥ 0.05) among diets. Chicks hatched from eggs laid by vaccinated hens during Weeks 2 and 3, however, had lower (P < 0.05) mortality than chicks of unvaccinated hens. It appears a dietary methionine concentration of 0.3% may be sufficient for wild Northern bobwhite to produce viable chicks. © 1996 Poultry Science Association, Inc. Metabolism and Nutrition nationallicence methionine nationallicence Northern bobwhite nationallicence Colinus virginianus nationallicence immunocompetence nationallicence reproduction nationallicence DABBERT C. B. Department of Zoology and Department of Animal Science, Oklahoma State University, Stillwater, Oklahoma 74078 aut LOCHMILLER R. L. Department of Zoology and Department of Animal Science, Oklahoma State University, Stillwater, Oklahoma 74078 aut WALDROUP P. W. Poultry Science Center 0-114, University of Arkansas, Fayetteville, Arkansas 72701 aut TEETER R. G. Animal Science Department, Oklahoma State University, Stillwater, Oklahoma 74078 aut Poultry Science Oxford University Press 75/8(1996-08), 991-997 0032-5791 75:8<991 1996 75 ps https://doi.org/10.3382/ps.0750991 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750991 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- DABBERT C. B. Department of Zoology and Department of Animal Science, Oklahoma State University, Stillwater, Oklahoma 74078 aut NATIONALLICENCE 700 1- LOCHMILLER R. L. Department of Zoology and Department of Animal Science, Oklahoma State University, Stillwater, Oklahoma 74078 aut NATIONALLICENCE 700 1- WALDROUP P. W. Poultry Science Center 0-114, University of Arkansas, Fayetteville, Arkansas 72701 aut NATIONALLICENCE 700 1- TEETER R. G. Animal Science Department, Oklahoma State University, Stillwater, Oklahoma 74078 aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/8(1996-08), 991-997 0032-5791 75:8<991 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford