Effect of dietary fat on reproductive performance of pregnant and lactating New Zealand white rabbit does [electronic resouce].
تأثير مستوى دهن العليقة على الاداء الانتاجي لامهات الارانب النيوزيلاندي الابيض الحوامل والمرضعات.
- p.833-850.
Includes references.
Forty-five New Zealand White (NZW) rabbit does, aging about 5 months with an average live weight of 3812 g, were used to study the effect of different levels of dietary fat on caectrophy, digestion, milk yield and composition, reproductive performance and economic efficiency during pregnancy and lactation periods. Three experimental diets were formulated to provide 2.5, 5.4 or 8.3% fat. The rabbit does were maintained on same diets during non-gestation, pregnancy and lactation states. Results showed that as fat% increased soft faeces (SF) excretion (g DM/d) increased (P<0.01) by 29.6%, while DM intake decreased (P<0.05) by 8.9%. Also, CP% of SF decreased (P<0.01) by 12.2% but its EE% increased (P<0.001) by 60.8%. The contribution of soft faeces to total DM and CP intake of lactating does decreased (P<0.001) by 13.8 and 11.3%, respectively, but in pregnant does it decreased (P<0.001) by 5.69 and 10.7%, respectively, as compared with control does. Digestibility of DM, OM and CF decreased significantly by 6.19, 5.95 and 26.4%, respectively, while digestibility of CP, EE and GE increased significantly by 3.69, 7.72 and 6.84%, respectively, as the level of dietary fat increased from 2.5 to 8.3%. Digestibility of nutrients and nutritive values were significantly higher in the lactating rabbit does than those of the pregnant rabbit does. Fat and DM contents of milk increased (P<0.001) by 34.2 and 11.3%, respectively, while CP and lactose contents of milk decreased (P<0.05 & P<0.01) by 8.8 and 16%, respectively, with increasing the level of dietary fat. Pregnant rabbit does given diets with 5.4 or 8.3% fat showed a higher (P<0.05) weight gain and a lower (P<0.05) feed intake than those fed 2.5% fat during pregnancy period. Daily feed intake of lactating rabbit does and pups decreased (P<0.01) by 12.1 and 13.8%, respectively, while milk yield increased (P<0.001) by 19.6% with increasing the level of dietary fat up to 8.3%. Feed and milk conversion ratios were significantly improved with rabbit does fed diet containing 8.3% fat during lactation period. Rabbit does fed high fat diet weaned more young rabbits than those received other diets (7.82 vs. 6.91; P<0.01). The mortality rate of the pups during the lactation period was higher in the diet with 2.5% fat compared to other diets (20.8 vs. 11.7%; P<0.001). Growth rate of pups in the period from 21 to 30 days of age tended to increase (P<0.05) by 5.91% as the level of fat increased from 2.5 to 8.3% in the diets. The rabbit does fed diet with 8.3% fat had the highest value of economical efficiency (%) as compared to those fed diet with 2.5% fat or 5.4% fat. It could be concluded that a diet with 8.3% fat was optimal for reproductive performance of NZW rabbit does during pregnancy and lactation periods under condition of this experiment.
Summary in Arabic.
Rabbits--Feeding and feeds. Rabbits--Nutrition. Rabbits--Reproduction. Low-fat diet.