Influence of nutrition supplementation on the seasonal change in fiber growth and skin follicle activity in both male and female Sanjabi lambs

•Effect of nutrition supplementation on wool growth of Sanjabi sheep was studied.•Seasonal change of fiber growth in Sanjabi sheep was investigated.•Seasonal change of skin follicles activity in Sanjabi sheep was studied. The present work aimed to investigate the effect of nutrition supplementation...

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Bibliographic Details
Published in:Small ruminant research 2015-01, Vol.123 (1), p.103-109
Main Authors: Naderi, N., Salehian, Z., Souri, M., Hodjabri, F., Mirmahmoudi, R.
Format: Article
Language:English
Subjects:
Dry matter intake
Fiber follicle activity
Follicular density
Photoperiod
Sanjabi
Sheep
Wool
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Summary:•Effect of nutrition supplementation on wool growth of Sanjabi sheep was studied.•Seasonal change of fiber growth in Sanjabi sheep was investigated.•Seasonal change of skin follicles activity in Sanjabi sheep was studied. The present work aimed to investigate the effect of nutrition supplementation on skin follicle activity and wool growth rate in male and female Sanjabi lambs during the autumn and winter seasons, when the natural daylength is declining and being shortest. Twenty male (control and male (CM), n=10; treatment and male (TM), n=10) and 20 female (control and female (CF), n=10; treatment and female (TF), n=10) Sanjabi lambs were housed in individual pens, under natural daylength condition at west of Iran, Kermanshah (34°18′ N and 47°3′ E and 1420m above sea level). Lambs in control groups received a diet consisting of 80% alfalfa and 20% concentrate, providing 2.18Mcal and 130.0g per kg DM ME energy and crude protein, respectively. In treatment groups, lambs were fed a diet consisting of 65% alfalfa and 35% concentrate, providing 2.34Mcal and 160.0g per kg DM ME energy and crude protein, respectively. Raw and clean fiber growth rates and fiber diameter were measured from left mid-side patches harvested at the end of every month. Percentage of active primary and secondary follicles (PAP and PAS), follicular density (FD) and the ratio of secondary to primary follicles (S/P) were measured from skin biopsies, taken from the right mid-side of the lambs in monthly intervals. PAP and PAS in autumn were significantly (p
ISSN:0921-4488
1879-0941
DOI:10.1016/j.smallrumres.2014.10.004