Ovarian activity of barki ewes in relation to plane of nutrition

The present investigation aimed to improve the ovarian activity of Barki breed by means of nutritional management. Three groups of Barki ewes were fed on maintenance ration, maintenance besides nitrogenous supplement and maintenance besides carbonesious supplement. The results revealed significant increases in live body weight and daily gain in supplemented groups than in maintenance one. In the same time, the estrous cycles were superior with regular rhythm in both supplemented groups. Plasma progesterone concentrations showed significant higher figures in ewes fed maintenance than in supplemented ewes

Gestation and lambing of barki ewes in relation to plane of nutrition

The present investigation aimed to improve the reproductive and productive efficiency of Barki ewes managed under different planes of nutrition. The experiment was carried out on 3 groups of Barki ewes fed on maintenance ration, maintenance beside nitrogenous supplement and maintenance beside carbonesious supplement for 3 months premating. The results revealed that the level of supplementation had a non significant effect on both the gestation length and the sex of the off spring. On the contrary, progesterone concentration showed significant decrease in the supplemented 2 groups [2.36 +/- 0.95 and 2.59 +/- 0.76 ng/ml]. Lambing rates averaged 90, 100 and 100% in the 3 groups, respectively, without twinning. Sex ratio of newly born averaged 1.5, 0.67 and 0.67, respectively, and lamb birth weight was significantly heavier in nitrogenous supplemented ewes [3.50 +/- 10.17 kg] than in carbonesious supplemented ones [3.20 +/- 0.17 kg] or in control group [2.95 +/- 0.21 kg]

Effect of plane of nutrition on reproductive performance in barki ewes 2gestation and lambing

The experiment was carried out on three groups of Barky ewes fed on maintenance ration. Additional supplement was offered three months premating. The first group was supplemented by high protein supplement [36.6% total protein and 2.4 Mcal/kg digestible energy]. The second group was supplemented by low protein level [11.9% total protein and 3% Mcal/kg digestible energy], and the 3rd group was kept on maintenance ration and used as control. The results revealed that the level of supplementation had a nonsignificant effect on both gestation length and the sex of the offspring. On the contrary, progesterone concentration showed significant [P <0.05] decrease in the two supplemented groups. Lambing rates averaged 100, 90 and 100% in the 3 groups, respectively, without twining. Sex ratio of newly born averaged 1.5, 0.67 and 0.67, respectively, and lamb birth weight was significantly [P <0.01] heavier in ewes supplemented with high protein level than in either those supplemented with low protein level or in the control group. It is recommended to keep Barky ewes at the premating period on high level protein supplement to improve health condition which reflected on the crop

Sterility in the dromedary

Sterility or the inability to reproduce within reasonable time is the cause of losses to the livestock producer. It is difficult to obtain accurate figures on the extent of these losses, because sterility may be either relative or absolute. Relative sterility infertility or delay in conception causes loss by lessening the number of spring and by keeping of the female for a longer time on the decling part of the lactation curve. On the other hand, losses from absolute sterility or complete failure of fertility, are more obvious, since no off spring is produced. It is very difficult to obtain a true picture of the incidence of infertility from many of the estinates made because they are based on unrepresentative samples. The applies, particularly to surveys made on material such as that abtained from abattoirs in which the breeding animals killed do not from a true sample of animal population. However, sine the camel joined recently the production club, one cannot expect to find well organized breeding farms for the dromedary. Therefore, the information collected on the present status of fertility impairing factors will be of great help in raising its reproductive efficiency. It is rather interesting to know that along will the faults of management, diseases account for the greatest amount of infertility in camels. They may be either specific diseases affecting the reproductive organs directly or non specific diseases that affect reproduction by reducing the efficiency of the animal as a whole

Some aspects of hormone research under the Egyptian environmental conditions

Despite the considerable progress achieved in hormone research, yet a lot of informations related to their biological activity need to be clarified. Endocrinology in livestock production involves scientific evaluation of the hormonal influence on health and adaptation including growth, fattening, reproduction and lactation. However, the present review deals with the experience gained during a research programme carried out by the Department of Animal Reproduction and A.I. of the National Research Centre of Egypt and connected with the mode of action of some hormones in reproduction, bacterial infection and lactation