Hormonal changes, immunological response and date of reentry in laying hens fed alfalfa molt diet

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SHAHRAMI E.; ROKNI H.

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Journal: Journal of Veterinary Research Year:2018 | Volume:72 | Issue:4 Page(s): 457-465

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Title

Hormonal changes, immunological response and date of reentry in laying hens fed alfalfa molt diet

Author(s)

SHAHRAMI E. | ROKNI H. | Issue Writer Certificate

Keywords

AlfalfaQ1

corticosteroneQ1

forced moltingQ1

laying hensQ1

thyroid hormonsQ2

Abstract

BACKGROUND: The use of feed withdrawal method for molt induction can cause physiological stress and negatively affect the immunological response of hens. OBJECTIVES: The aim of the present study was to survey of hormonal changes and immunological response in hens fed Alfalfa molt diet during the molt period. METHODS: In this experiment 108 Hy-line (W36) laying hens aged 74 weeks in a completely randomized design with 3 treatments and 6 replicates were used. The treatments used for 12 days molt period included: 1-control group fed with layer ration (FF), 2-feed withdrawal group (FW), 3-group fed with 90% Alfalfa and 10% layer ration (A90). Performance of birds was monitored for 12 weeks after the end of the molting period. RESULTS: Total circulating leukocytes were generally lower in FW hens group compared with the other groups during the initial stage of molt (p<0. 05). On day 3 and 6 of molt, heterophil to lymphocyte ratio was increased in molted hens and FW hens had higher levels than other groups. On day 3 of molt, plasma corticosterone was generally increased in molted hens and FW hens had a higher level than A90 hens (p<0. 05). Plasma T3 was significantly decreased in molted hens than nonmolted hens during the molt period (p<0. 05). Plasma T4 was significantly increased in molted hens than nonmolted hens during the molt period (p<0. 05). On day 6 and 9 of molt, concentrations of T4 were higher in FW hens than in the A90 hens (p<0. 05). Date of reentry and days return to 50% and 80% egg production were significantly lower in A90 groups than in the FW groups (p<0. 05). CONCLUSIONS: The results showed that, A90 diet can limit physiological stress and improve the performance of immunological response that accompanies feed withdrawal method during an induced molt.

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APA: Copy

SHAHRAMI, E., & ROKNI, H.. (2018). Hormonal changes, immunological response and date of reentry in laying hens fed alfalfa molt diet. JOURNAL OF VETERINARY RESEARCH, 72(4 ), 457-465. SID. https://sid.ir/paper/34636/en

Vancouver: Copy

SHAHRAMI E., ROKNI H.. Hormonal changes, immunological response and date of reentry in laying hens fed alfalfa molt diet. JOURNAL OF VETERINARY RESEARCH[Internet]. 2018;72(4 ):457-465. Available from: https://sid.ir/paper/34636/en

IEEE: Copy

E. SHAHRAMI, and H. ROKNI, “Hormonal changes, immunological response and date of reentry in laying hens fed alfalfa molt diet,” JOURNAL OF VETERINARY RESEARCH, vol. 72, no. 4 , pp. 457–465, 2018, [Online]. Available: https://sid.ir/paper/34636/en

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