Estimation of Regression Equations of Awassi Sheep Performance  on Teats Morphological Traits

Hubaety A.K.H, Al-

	Estimation of Regression Equations of Awassi Sheep Performance on Teats Morphological Traits
Journal of Tikrit University For Agriculture Sciences
Article 1, Volume 18, Issue 2, 2018, Pages 182-191
Author
Al- Hubaety A.K.H
Abstract
In this study, 50 ewes were given births during the period from 15th of November 2003 until 28 of February 2004. the present study started on 15th of November, 2003 and concluded on the 15th of may, 2004. they were kept under the same management, housing and treatment conditions, as far as the nutrition is concerned, similar to the traditional method used by the farmers in rural regions. Milk production was recorded for each single ewe twice a day. The length and circumference of teats and the distance between them were measured biweekly. Fat and protein percents and somatic cell of the produced milk along with were determined biweekly, too. The effect of the fixed factors, teats measurements , on performances and regression equations were determined in order to predict ewes performances based on teats measurements SCC, independent factors. Performance means comparison indicated: T- test showed that there a significant difference in milk yield as a result of average teats length and distance between them, with no significant difference for fat and protein percentages detected. Effect of factorial interaction: the following results observed; Teats length and there diameter interaction showed significant effect on milk yield. Teats length 3.1- 4.5 cm and 2.1- 3 cm diameter interaction was significantly more effective on milk yield than those teats with (1.5- 3.0) cm length and (1.0- 2.0) cm. diameter, average fat percent was significantly superior from ewes with (1.5- 3.0) cm teat length and (2.1- 3.0) cm. diameter over those with (3.1- 4.5) cm. length and (2.1- 3.0) cm. diameter. Teats diameter- distance interaction: Fat percent was statistically higher in ewes of (2.1- 3.0) cm. diameter with (18.5- 24.5) cm. distance than those of (1.0- 2.0) cm diameter and with the same distance. Teats length- diameter and distance interaction: Average milk Production and protein percent were numerically increased duo to the teat length- diameter and distance interaction. Average fat percent. Ewes of (1.5- 3) cm. teat lengths with (2.1- 3) cm. diameter with in (12.4- 18.4) cm. distance produced higher fat percent than those of the same teats length with average teats diameter ranged from (1.0- 2.0) cm. and (18.5- 24.5) cm. distance. In conclusion, it can be stated that the ewes characterized by having longest teats with more distance and diameter are best individuals for milk production and performance.
Keywords
udder morphology; Awassi sheep; milk composition

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