Milk production, feed conversion rate and reproduction of Zaraibi goat in response to bacterial feed additive during late pregenecy and lacation [electronic resource].

Includes references.

This work was carried out on Zaraibi does to investigate the effect of using commercial microbial supplement (Lacture) on milk production. feed conversion efficiency and some blood constituents as well as reproductive parameters such as still birth litter size kidding rate and kilograms of kids produced per doe per year in addition to performance of the offspring. Twenty one pregnant does were divided into three equal groups (Gl. G2 and G3) and fed according to NRC allowances. where diets contained O. 1 and 2g Lacture / head! day, respectively. The data indicated that daily milk yield during suckling period was increased (1.341 kg. 1.593 kg. and 1.669 kg.) with increasing the level of Lacture (0. 1 and 2 g/head/d) in the three groups GI, G2 and G3 respectively Moreover average milk yield during lactation period was improved by 7.06% and 13.79% in G2 and G3 groups. Respectively compared with the control, differences were found to be significant during either experimental period. The effect of treatment was positive on milk composition especially milk protein and lactose, however no significant effects of Lacture were observed on milk quality. The feed utilization efficiency (based on DM and CP) was better in G2 and G3 groups (over 10%) compared with G 1 group Litter size ranged from 1.86 to 2.14 with no-significant differences among treatments. Daily body gain of kids was significantly improved in G2 (105.2 g) and G3 groups (108.5 g) by 1J.9/%-and 15.43% respectively compared with that of G group (94.0 g) The mortality rate of kids was 7.1% in G2 and 0.00 in G3 vs. 13.3% in the control group. Thus, output measured as kilograms of kids produced per doe per year improved significantly due to Lacture supplementation. Accordingly the economic efficiency was higher due to using Lacture at levels 1 and 2 g/head/day compared with the control one ( 0 g).

Summary in Arabic.

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