 หัวเรื่อง:ผลของการจำกัดอาหารต่อการเจริญเติบโตพัฒนาการของรังไข่และท่อนำไข่ และอัตราการตายในไก่ไข่ สื่อสิ่งพิมพ์:pdf AbstractThe effects of two feed restriction programs, in which the chickens were fed for 8 hours a day (8h-fed group) and fed for eighty-five percent of the amount consumed by full-fed chickens (85%-fed group), and of conventional free feeding program (ad libitum group) on growth, development of ovary and oviduct, and mortality rate in the layer were studied. The results showed that the two feed restriction programs caused a delay in growth and a deterioration in feed conversion rate. Body weight of the 8h-fed group was lower than that of the ad libitum group at 16w. (1271g VS 1384g, P<0.05) whereas that of the 85%-fed group was lower at both 16w. (1293g VS 1384g, P<0.05) and 20w (1479g VS 1550g, P<0.05). Changing a half each of the 8h-fed and 85%-fed groups to the full feeding, and a half of the adlibitum group to the 85% feeding resulted in no significant change in body weight in any but the 85%-fed group. The 85%-fed turned full-fed bird was heavier than the remained 85%-fed bird (1861g VS 1689g, P<0.05) with higher content of the abdominal fat (107g VS 39g, P<0.05). Development of the ovary and oviduct was generally depressed by the 85% feeding program, though the difference (P<0.05) was observed only at the age of 40w. The ovary weight, oviduct weight and oviduct length of the 85%-fed group were 13.0g, 22.3g, and 59.7cm. compared with 37.2g, 53.6g, and 104.0cm of the ad libitum group and 43.0g, 55.9g, and 101.3cm. of the 8h-fed group, respectively. The three groups showed a similar number of small (diameter<2mm.) and medium (diameter 2-8mm.) follicles (P>0.05). Only the number of large follicle (diameter>8mm.) was negatively affected by the 85% feeding program. At 40w, the average number of 1.7 units of large follicle observed in the 85%-fed group was lower (P<0.05) than 5.7 and 6.0 units found in the 8h-fed and ad libitum groups, respectively. The number was, however, increased to equality with those of the other two groups after being switched to the full feeding. |
หัวเรื่อง:ระดับสเตอรอยด์ฮอร์โมนพื้นฐาน และการพัฒนาการของอวัยวะสืบพันธุ์ของไก่พื้นเมืองและไก่ไข่ลูกผสมทางการค้าในสภาวะการให้ผลผลิตไข่ที่แตกต่างกัน ผู้เขียน: Ratana Chotesangasa, Supaporn Isriyodom,  ดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractBasal steroid hormone profiled in plasma of the chicken changed according to states of egg production and degrees of oviduct development. Whereas the levels of basal progesterone and estradiol showed a clear connection with the he-day egg production, the levels of testosterone and progesterone were more likely involved with the degree of oviduct development. The hen with its hen-day egg production record above 80% (Good layer) had higher (P<0.05) concentration of progesterone and estradiol than the hen with its egg production record below 25% (Layer) and the hen which laid no egg at all (Nonlayer). When a comparison was made between the 2 breeds within the same group of Good layer, it was found that the native Good layer had lower testosterone and progesterone concentrations as well as lower oviduct weight than the commercial Good layer (P<0.05). The coincidence indicated a probable involvement of the two hormones in growth and development of the oviduct. States of development of the ovary and oviduct were also related to states of egg production. It was clear that the Good layer always had heavier and longer oviduct than the Layer and the Nonlayer (P<0.05). Despite holding the same good egg production record, the native Good layer tended to have lower degree of the oviduct development than the commercial Good layer, but only the oviduct weight that the significant difference (P<0.05) was observed. The numbers of small-sized follicles (diameter < 2 mm.) of the hens in different states of egg production or of different breeds were comparable (P>0.05). The numbers of medium-size (diameter 2-8 mm.) and large-size (diameter > 8 mm.) follicles tended to increase with the hen-day egg production. The native hen also showed a trend of having fewer number of the medium-sized and large-sized follicles. The differences were, however, not significant (P>0.05). |
 ผลงานตีพิมพ์ในวารสารวิชาการEffect of progesterone administration on the distribution of oviductal carbohydrates in Rana tigrinaผู้แต่ง:Magerd, S, Somrit, M, Prachaney, P, Mrs.Amara Thongpan, Associate Professor , Mrs.Kannika Chatchavalvanich, Associate Professor, Sretarugsa, P, Weerachatyanukul, W, วารสาร:  
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