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Mansoura University (2017)

Effect of adding some protected amino acids on some wool characteristics in barki sheep

Abo El-Naga, Alaa Hamada Youssef Hamad

Titre : Effect of adding some protected amino acids on some wool characteristics in barki sheep

Auteur : Abo El-Naga, Alaa Hamada Youssef Hamad.

Etablissement de soutenance : Mansoura University

Grade : Master of Science (MSc) in Agriculture Science 2017

Résumé partiel
The present study was conducted at Maryout Research Station of the Desert Research Center, located 35-km south-west of Alexandria, in cooperation with the Department of Animal Production, Faculty of Agriculture, Mansoura University. Twenty four adult Barki ewes were used to investigate the effect of addition of rumen protected amino acids, lysine or/and methionine on some wool characteristics. This study was carried out from September 2016 to February 2017. Animals were divided into four groups (6ewes/group). The first group (Control) : fed only the control diet, second group (LYS) : fed the control diet and rumen protected lysine (6g Lysi pearl /kg concentrate, 3g /animal/day), third group (MET) : fed the control diet and rumen protected methionine (14g Smartamin/kg concentrate, 7g /animal/day) and fourth group (LYS+MET) : fed the control diet and mixture of (3g LYS and 7g MET/animal/day) for six months. Animals were fed on Berseem hay (Trifolium alexandrinum), offered and libitum plus concentrate mixture (at a rate of ½ kg/head/day) (14%CP and 60%TDN) which was composed of cottonseed cake 50%, wheat bran 18%, yellow corn 15%, rice polish 11%, molasses 3%, limestone 2% and common salt, 1%). Water was provided twice daily. Wool samples were harvested from the left mid-side position of each ewe three times at September (time 0), December (after 3 months) and February (after 6 months) and used to investigate some of wool measurements such as fiber diameter, fiber length, staple length, fiber length rate, staple strength, elongation, point of break, clean wool yield and wool component of amino acids. The blood samples were collected for each animal at the end of the experiment to determine plasma component of amino acids. The results of the present study could be summarized as follows : 1.Fiber length : Results showed that fiber length significantly increased by supplementing methionine, lysine and mixture of methionine and lysine compared with control. Furthermore, the fiber length was higher in all treatments after 6 months compared with 3 months of experiment. 2.Fiber length rate : Supplementing methionine, lysine and mixture of methionine and lysine caused significant increasing in fibre length rate compared with control. 3. and lysine or lysine showed significant increase in wool staple length compared with control. However, addition of methionine showed insignificant increase in wool staple length compared with control. The wool staple length increased with increased the time of treatment. 4.Fiber diameter : Addition of protected amino acids tended to make a slight increase in fiber diameter especially with lysine and lysine with methionine compared with control group. Also, Supplementation of methionine leads to significant increase in fiber diameter compared with other groups. Fiber diameter of wool increased by increasing the time of treatment. 5. Clean wool yield : Addition of methionine resulted significantly in higher percentage of clean wool yield, whereas addition of lysine had insignificantly lower percentage of clean wool yield. The percentage of clean wool yield increased with increased the time of treatment. 6. Staple strength : Staple strength increased significantly by adding methionine or lysine and methionine compared with control. Whereas, addition of lysine did not cause significant effect on staple strength.

Présentation étendue (EULC)

Page publiée le 7 mai 2019