| Titles |
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English :
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Studies on reproduction in Goats
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Arabic :
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دراسات على التناسل في الماعز
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| Abstract |
This study was carried out in the Department of Animal Production,' Faculty of Agriculture, Zagazig University. The data collected on 33 Anglo-Nubian does at El-Gemmiza Experimental Station, Animal Production Research Institute Ministry of Agriculture, Egypt. The aim of the study was to estimate some productive and reproductive traits of Anglo-Nubian goats, under Egyptian conditions.
The results obtained were as follows:
1. The body weights general means were 2.2, 10.5 and 12.3 kg at birth, weaning and six months of age, respectively.
2. The body weights studied were higher in the 2nd birth season (Winter) than in 1st birth season (Summer).
3. The male kids were heavier than females in body weights at birth, weaning and six months of age.
4. Twin kids were lighter than singles and heavier than triplets in their body weights at the ages studied.
5. The birth weight increased, in general, until it reached the maximum at 6th parity and the maximum weaning weight was reached at the 5th parity. The maximum six months body weight was obtained at the 6th parity.
6. The effects of the season of birth on all the measurements of body weight of kids were not significant.
7. The effects of sex of kids on birth and six months body weights were highly significant.
8. The effects of type of birth on the measured body weights of kids were not significant.
9. The effects of parity on body weights at birth and six months of age, were significant t.
10. The correlation coefficients were positive and highly significant between weaning weight and six months weight (r = 0.67), positive and significant between birth weight and six months weight (r = 0.36) and positive and not significant between birth weight and weaning weight (r = 0.27).
11. The correlation coefficients were positive and highly significant between pre-weaning gain and each of weaning weigh t and six months weight (r = 0.95 and 0.62., respectively) and between postweaning gain and six months weight (r = 0.59).
12. The correlation coefficient values were positive and significant between growth rate and each of weaning weight and six months weight in 1st and 2nd seasons.
13. Average age at puberty of female kids born in June-July was 460.5 days .and average body weight at puberty was 20.5kg. The onset of puberty occurred in September (natural reproduction season).
14. The correlation coefficient values were positive and highly significant between age at puberty and each of post-weaning gain and growth rate (r = 0.92 and 0.90, respectively).
15. The general means of conception rate, numbers of kids born and weaned per doe mated were 78.5, 104.7 and 67.3%, respectively.
16. Conception rate was higher in the 1st (January) mating season (96.4%) than in the 2nd (October) mating season (60.6%).
17. The numbers of kids born and weaned per doe mated were higher in 1st mating season than in the 2nd season.
18. The conception rate decreased until the 3rd parity and number of kids born por doe mated decreased till the 2nd parity, then both increased to reach the maximum values at the 6th parity. The number of kids weaned per doe mated showed no definite trend according to parity.
19. The effect of mating season was highly significant on conception rate and number of kids born per doe mated and not significant on number of kids weaned per doe mated.
20. The effects of parity on conception rate, numbers of kids born and weaned per doe mated, were not significant.
21. The general means of numbers of kids born and weaned per doe kidded. kilograms of kids born and weaned per doe kidded were 131.2,84.4, 2.9kg and 8.9kg, respectively.
22. The number of kids born per doe kidded increased to reach the maximum value at the 3rd parity. The number of kids weaned per doe kidded, kilograms born and weaned per doe kidded showed no definite trend according to parity.
23. The effects of kidding season and parity on prolificacy measurements were not significant.
24. The general mean of the interval from kidding to the onset of the first postpartum oestrus was 110.7 days.
25. Postpartum oestrus period was affected by date of kidding. It was 98.3 and 123.2 day for does kidded in June-July and February-March,
respectively. The effect of season of kidding on the studied trait was highly significant.
26. The postpartum oestrus in does giving birth to singles was the shortest among those with twin and triplet births. The effects of type of birth on postpartum oestrus, was not significant.
27. The correlation coefficient values were positive and highly significant between postpartum oestrus and each of season of kidding and lactation length and negative and not significant between postpartum oestrus and type of birth.
28. The least squares mean of total milk yield produced during 100.9 days was 79.2 kg.
29. The milk yield reached the peak at 3rd to 5th weeks of lactation, then declined till the end of lactation.
30. Milk yield was significantly higher in the 2nd season (110.2 kg) than in the 1st season (48.2 kg). The effect of season on milk yield was
highly significant.
31. Does reared twins gave more milk yield (86.00kg) than those reared singles (77.9kg). The effect of type of birth on milk yield was not significant.
32. Milk yield increased with increasing parity up to maximum at 5th parity. Parity effect on milk yield was not significant.
33- The effect of doe weight at kidding on milk yield was highly significant.
34. The correlation coefficient values were positive and highly significant between total milk yield and each of doe weight at kidding and lactation length and negative and not significant between total milk yield and doe weight at service.
35. The mean yield of the morning milking was significantly higher (P < 0.05) than that of the evening milking.
36. The average milk yield relatively to one kilogram of doe weight at kidding was 2.5 kg.
37. Average percentages of fat, protein, lactose, total solids and solids not-fat were 3.14, 3.35, 4.56, 12.81 and 8.46, respectively, during the lactation period.
38. Milk constituents seemed, in general, to increase during lactation period, except the lactose which decrease during the same period.
39. The effects of sampling times on milk constituents, were highly significant.
40. The correlation coefficient values were positive and highly significant between fat and each of protein and total solids, protein and each of total solids and solids-not-fat and positive and significant between lactose and solids-not-fat.
41. Percentages of all milk constituents were higher for the evening mil kings than for the morning milkings.
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| Publication year |
1993
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| Pages |
PP. 150
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة
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| Availability number |
411
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| Organization Name |
Animal Production Research Institute (APRI)
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| Country |
Egypt
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Birth weight.
Females.
Goats.
Males.
Production.
Reproduction.
Seasons.
Sexual maturity.
Siblings.
Weaning weight.
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| Publication Type |
Master Thesis
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