Journal of Food, Agriculture and Environment

Vol 10, Issue 1,2012
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Sheep breed type effects on plasma thyrotropin, thyroxine and testosterone in growing ram lambs under hot climate


Mona A. Al-Damegh

Recieved Date: 2011-09-09, Accepted Date: 2012-01-06


The lack of knowledge about different physiological responses among indigenous sheep breeds raised in arid hot regions promoted the researcher to monitor a metabolic and a reproductive hormone in male lambs of two common breeds in Saudi Arabia. Forty eight growing male lambs (age; 3-5 months) were grown in a private farm for fattening purpose. The animals were of two known breeds commonly raised in Saudi Arabia, namely Najdi and Noemi. Twenty four Najdi and 24 Noemi lambs were utilized in the study during hot months (June-August). Jugular blood samples were collected for eight consecutive weeks. Plasma was harvested and Thyrotropin (TSH), Thyroxine (T4) and Testosterone (T) were determined. There found significant (P<0.05) increases in TSH, T4 and T in Noemi (1.54 m IU/l, 11.91µg/dl and 6.25 ng/ml, respectively) than in Najdi (1.39 m IU/l, 7.55 µg/dl and 3.38 ng/ml, respectively) lambs. The week to week changes in the levels of the three hormones were not statistically significant (P>0.05). The increases in the three hormones in Noemi males paralleled the concurrent increases in body growth rates (174 vs 139 g/hd/day for Noemi vs Najdi). In conclusion, within a species there exists physiological differences worth to be monitored for managerial purposes.


Breed-type, hot climate, rams lambs, testosterone, thyrotropin, thyroxin

Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 1
Category: Agriculture
Pages: 530-533

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