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Tanta University (2020)

Effect of Probiotics Supplementation on Nutrient Utilization and Production Performance in Sheep Fed on Atriplex sp

Ibrahim, Mabrouk Zaher Abd El-Galil.

Titre : Effect of Probiotics Supplementation on Nutrient Utilization and Production Performance in Sheep Fed on Atriplex sp

Auteur : Ibrahim, Mabrouk Zaher Abd El-Galil.

Etablissement de soutenance : Tanta University

Grade : Master of Science (MSc) in Agricultural Science 2020

Résumé partiel
This study was carried out at the Maryout Research Station, (South Alexandria ; longitude 29°47′ and 15°27′ E and latitudes 31°00′ and 18°37′ N) Desert Research Center, Egypt. The present study consisted of two experiments : 1st experiment : Ewes performance : Thirty pregnant multiparous Barki ewes with an initial body weight (BW) of 45.5 ± 0.98 kg, were blocked according to lambing date and BW into three experimental groups (ten ewes in each group), and housed in individual pens. Animals had free access to water. The trial lasted for 16 weeks, starting from the last month of pregnancy to weaning. The treatment diets were (control) basal diet with no supplementation, (Yeast) basal diet with inclusion of 2 g of commercial yeast/ewe/d [each 1 gm contained 2×1010 CFU Saccharomyces cerevisiae] and (Probiotic) basal diet with inclusion of 2 g of probiotic/ewe/d [Bacillus subtilis (1.0x1011 CFU) and Lactobacillus casei (1.0x1010 CFU)]. The experimental diet was formulated to meet their nutrient requirements according to NRC (2007) recommendations. Ewes were weighed biweekly prior to morning feeding to calculate the changes of body weight. Animals milked biweekly for 3 months from parturition by hand milking, the milk yield and milk composition were recorded. Individual feed intake recorded daily and averaged weekly throw the trial period. At the end of the experimental period, rumen liquor was sampled at 4h. post feeding by stomach tube to determined rumen fermentation parameters. Also, at the same day, blood samples were collected from jugular vein from each ewe before feeding for determinate of blood metabolites. 52 Summary and conclusio n The results could be summarized as follows : 1- There was no significant differences on initial BW, BW at lambing, BW at weaning and BW changes for ewes. 2- However, no effect was found on birth weight of lambs compared to control, the weaning weight supplemented with bacteria was higher (P < 0.05) compared to control. 3- Average daily gain (g/d) of lambs supplemented with bacteria was higher (P < 0.05) compared to the yeast and control groups. The values were 147.3, 157.7 and 173.0 g/d for control, yeast and bacteria groups, respectively. 4- 20.0% of the lambs in the control group had diarrhea, whereas lambs from ewes supplemented with either yeast and bacteria had no incidence of diarrhea during the suckling period. 5- Diets supplemented with yeast or bacteria showed higher (P < 0.05) dry mater intake (DMI) of the diet compared to the control diet. 6- There were no significant differences in milk yield among the experimental treatments. 7- Fat, protein, ash, lactose and total solids percentages were not affected by probiotics supplementation. Also, diet efficiency expressed as milk, g/ DMI, g was not influenced by probiotics supplementation. 8- Ruminal pH were similar across the treatments being values 6.29, 6.26 and 6.25 for control, yeast and bacteria, respectively. 9- Supplemented diets was higher (P < 0.05) on ruminal ammonia compared to the control diet. The values were 7.53, 12.27 and 13.47 mg/dl rumen liquor for control, yeast and bacteria groups, respectively.

Présentation étendue (EULC)

Page publiée le 27 décembre 2020