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Alexandria University (2013)

REPRODUCTIVE EFFICIENCY OF SHAMI GOATS IN SALT AFFECTED LANDS IN SOUTH SINAI

EL-HAWY,AHMED SOBHY ALI ALI

Titre : REPRODUCTIVE EFFICIENCY OF SHAMI GOATS IN SALT AFFECTED LANDS IN SOUTH SINAI

Auteur : EL-HAWY,AHMED SOBHY ALI ALI.

Etablissement de soutenance : Alexandria University

Grade : Doctor of Philosophy (PhD) in Agricultural Science 2013

Résumé
The present study was carried out during the period -#102 ;-#114 ;-#111 ;-#109 ; August 2009 to July 2010 at Ras sudr Research Station in South Sinai (200 km east of Cairo), that belongs to the Desert Research Center, Ministry of Agriculture, through ICBA-DRC bilateral project. br 48 Shami goats (2.0-2.5 years old with average body weight of 27.8 ± 3.22 kg) were divided randomly into equal 4 groups (12 of each). Groups 1 and 2 were received berseem hay while groups 3 and 4 were received salt-tolerant plants (alfalfa). Animals received concentrate feed mixture to cover 125% of their maintenance requirements of energy. Groups 1 and 3 were drinking fresh tap water (247 ppm, TDS) while the other two groups (2 and 4) were drinking saline water (6000 ppm, TDS). br This work was conducted to determine the effect of salinity (salt-tolerant alfalfa and drinking saline water) on hormonal profiles and reproductive performance as well as productive efficiency of Shami goats over full reproductive cycle. Body weight, reproductive and productive traits, in addition to hemo-biochemical parameters for different experimental groups were recorded during different physiological stages. br The main results could be summarized as follows : br 1.Total dissolved salts and other minerals (Ca, P, Na, K and Cl) increased in saline water compared to fresh water (5980 and 274 ppm, TDS for saline and fresh water, respectively). br 2.Results of chemical composition revealed that alfalfa has higher percentage of nitrogen free extract (average 50.49 vs. 41.3%), ether extract (average 2.51 vs. 1.38%) and crude protein (average 18.82 vs. 14.5%) while, decreased in crude fibers (average 20.63 vs. 28.20%) and ash content (average 7.55 vs. 11.61%). br 3.The minerals concentrations increased in alfalfa compared to berseem hay, whereas Na (1.4 vs. 0.7%), K (1.72 vs. 1.24%), Ca (0.962 vs. 0.682%) and P (0.666 vs. 0.233%). br 4.Conception rate insignificantly increased in alfalfa groups as compared to berseem hay groups. G3 and G4 recorded 90 and 80% while, G2 and G1 recorded 90 and 75% respectively. br 5.Group 3 recorded high percentage of kidding rate (91.75%) then G2 and G4 (83.3%) while, G1 recorded 75% br 6.Estradiol-17β (E2) and progesterone (P4) profiles during estrous cycle were found to follow the normal pattern reported during follicular and luteal phases in the cycle with insignificant differences between alfalfa groups and berseem hay groups. br 7.During pregnancy, E2 levels did not differ significantly among the four experimental groups and maintained unchanged till 145 days of gestation, then started to increase sharply till parturition. While, P4 levels decreased significantly, reaching their lowest values on the day of mating and increased with the progress of pregnancy exhibiting two peaks at days 17 and 130 of pregnancy and gradually declined thereafter till parturition. br 8.Results indicated that feeding had no significant on milk yield during lactation stages, while ; drinking water had a negative significant effect on milk yield. br 9.Mid lactation (week 6 and 8) recorded high milk production compared to early (week 2 and 4) and late lactation (week 10 and 12). br 10.Chemical composition of milk samples showed that insignificant differences in all parameters except lactose which increased significantly in berseem hay groups than alfalfa groups. br 11.During early pregnancy, total dry matter intake (TDMI) (kg/h/d) was found to be 1.13, 1.11, 1.15 and 1.16 for G1, G2, G3 and G4, respectively representing 3.2% of their respective body weights.

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