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Reflection of environmental adaptation on
reproductive performance in indigenous
and exogenous goats.
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Abstract: This study was carried out at Sakha Experimental Station, Animal Production Research Institute, Ministry of Agriculture. The present study covered two seasons hot season and cold season.
A total number of 31 non pregnant does (15 Egyptian Baladi and 16 Damascus) goats were selected randomly to study the adaptive responses and reproductive performance under hot season but, in cold season a total number of 20 does were used (10 Baladi and 10 Damascus). The age of does ranged between 1.5 and 4.0 years old, while their live body weight ranged between 32 and 37 kg for Egyptian Baladi and ranged between 45 and 75 kg for Damascus goats. The experimental field work was conducted throughout the priced from August to the end of September (hot ) and from February to the end of March (cold season). These months were representing the two major seasons of the year in Egypt.
The aim of the present study was to investigated the general adaptive physiological symptoms as response to fluctuations in climatic conditions, seasonal and diurnal, reproductive performance denoting the biological. adaptation to that seasonal and diurnal conditions and comparing these adaptive and reproductive responses in both native (Egyptian Baladi) and exotic (Damascus) goats.
The main results and conclusion obtained from this study could by summarized as follows:
Rectal temperature of Baladi arid Damascus was greater in hot season than cold season. Both Baladi and Damascus goats in hot season and cold season had greater rectal temperature in afternoon than morning. In hot season there was no different in respiration rate between Baladi and Damascus goats at morning or afternoon, but in cold season at morning respiration rate of Damascus was greater than Baladi. but at afternoon respiration rate of Baladi was greater than Damascus. In hot season respiration rate was greater at afternoon than morning. In both Baladi and Damascus goats, the skin temperature was greater in hot season than cold season at morning and afternoon, Skin temperature was greater in afternoon than morning in both breeds goats. Hair temperature of Damascus was greater than Baladi in hot season But in cold season at morning hair temperature in Baladi was greater than Damascus at afternoon in cold season hair temperature of Damascus was greater than Baladi. Hematocrit value was greater in cold season than in hot season and was greater at morning than at afternoon in hot season in both Baladi and Damascus goats,
Hemoglobin concentration was greater in cold season than in hot season in both Baladi and Damascus goats. At morning and afternoon. Thyroxine concentration was greater in cold season than in hot season in both Baladi and Damascus goats.
Tri iodo thyronine concentration was greater in cold season than in hot
season in both Baladi and Damascus
In cold season (February and March) both Baladi and Damascus goats showed no estrous behavioral symptoms, Thirty - Six estrous were observed and recorded during hot season month for 31 does (15 Baladi and 16 Damascus). The first estrous occurred in Baladi does earlier than that in Damascus goats (10 August vs. 21 September, in average). Progesterone concentration in peripheral blood plasma' was measured to monitor the ovarian activity. During cold season, it could be concluded that Damascus does had greater ovarian activity, higher progesterone level, longer ovulatory cycles and two contentious ovulatory cycles than Baladi does. Thirteen does, 5 Baladi and 8 Damascus, out of 31 does were showed regular cases of progesterone concentration profile.
In irregular cases in progesterone concentration. profile during hot
season Similar to the case in cold season, the progesterone concentration was greater in Damascus does than that in Baladi does. Signs of estrous manifestation of Baladi does were more conspicuous than Damascus does. Estrous signs could be classified into four categories according to the percentage of occurrence. The first category strong and more frequent signs (ranged between 90 -100%), mucus discharge from vulva, redness of vulva, seeking and following the buck, wagging the tail and sniffing the buck's scrotal region. The second category was medium intensity and less frequent (ranged between 50-70%), butting the buck's head. Feeble and low frequent symptoms (ranged between 5-20%) were mounting the buck (mutual behavior with buck). The fourth category was, rarely occurred (ranged between zero to 5%) mounting of the other goas, homosexual behavior. Estrous does were characterized by the common estrous signs such as a lack of interest in feeding and restlessness in all does of both breeds.
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| Publication year |
1997
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| Pages |
114p.
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة
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| Availability number |
581
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| Organization Name |
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| Country |
Egypt
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| Department |
Sheep and Goat Research Department
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Adaptation.
Environmental management.
Goats.
Reproductive performance.
Seasons.
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| Publication Type |
Master Thesis
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