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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Utilization of Different Basal Diets for Molt Induction in a Strain of Commercial Laying Hens) ผู้เขียน: ดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์ , ดร.ชัยวัฒน์ บุญแก้ววรรณ, ผู้ช่วยศาสตราจารย์ ,  Viriya Lungyai, Panaput Guntapa สื่อสิ่งพิมพ์:pdf AbstractThe objective of the study was to evaluate a nonfasting method for induced molting of laying hens by using different basal diets. An experiment was conducted using 300 H&N Brown hens (aged 95 wk ) randomly assigned to one of five treatment groups: group 1 (NC), which served as the non-molt control group, was provided with a layer ration and exposed to a 16:8 daylight:dark (L:D) photoperiod daily throughout the study, whereas groups 2 (BR), 3 (RB), 4 (C) and 5 (CM) were subjected to an induced molting program. Hens in the BR group were fully fed with a broken rice molt diet, whereas for 14 days, hens in the RB, C and CM groups received rice bran, corn mash and cassava mash molt diets, respectively. During the 2 wk molt period, all birds were exposed to an 8L:16D photoperiod and had access to drinking water at all times. Following the molting period, all hens were fed the layer ration and provided with 16 h of light per day, and production performance was measured for 20 wk. The CM treatment resulted in total cessation of egg production within 7 d. Egg production of hens in the BR, RB and C treatments all decreased to 3.7, 2.6 and 8.7%, respectively. Bodyweight loss ranged from 6.0 to 22.0%, with the highest value for the CM treatment. At the end of the molt period, no significant differences in the mortality rate, the ratio of heterophil to lymphocyte numbers and plasma cortisol concentrations were found among the experimental bird groups. No consistent differences were observed among the molt treatments throughout the 20 wk postmolt period for egg production, egg weight or egg quality. However, the peak of egg production of hens in the CM treatment reached a level of 70% of hen-day egg production, which was higher than those of the other treatments. In addition, during the early phase of the postmolt period, egg production and albumen quality of the CM treatment were significantly improved as compared to those of the control group. At week 2 of the postmolt period, the egg shell thickness of the CM treatment was significantly lower than that of the control group. The results indicated that feeding the cassava molt diet is an effective non-feed removal method for molting laying hens. However, the technique needs to be adjusted to improve egg production and egg shell quality. Keywords: molting, laying hen, cassava, egg quality, cortisol |
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ที่มา:การประชุมวิชาการมหาวิทยาลัยเกษตรศาสตร์ ครั้งที่ 51 สาขาพืชหัวเรื่อง:ผลของการใส่ปุ๋ยเคมีต่อผลผลิตข้าวโพดเลี้ยงสัตว์และข้าวโพดหวาน |
ที่มา:การประชุมวิชาการมหาวิทยาลัยเกษตรศาสตร์ วิทยาเขตกำแพงแสน ครั้งที่ 6หัวเรื่อง:ผลของการใส่ปุ๋ยมูลโคร่วมกับปุ๋ยเคมีเป็นปุ๋ยรองพื้นต่อการเจริญเติบโตและผลผลิตข้าวพันธุ์ขาวดอกมะลิ 105 |
หัวเรื่อง:ผลของการจำกัดอาหารต่อระดับสเตอรอยด์ฮอร์โมนพื้นฐานและการไข่ในไก่ไข่ สื่อสิ่งพิมพ์:pdf AbstractThe effect of feed restriction on basal steroid hormone levels, and egg production in the layer was studied. Two feed restriction programs; in which the 12-week-old chickens had access to feed for 8h a day (8h-fed group), and had each day for 85% of the calculated amount of feed consumed by the conventional full fed (85%-fed group), were compared with a free-feeding program in which the chicken received the same diet but on an ad libitum basis (ad libitum group). The results showed that serum progesterone and estradiol levels of the three groups were generally increased with age from growing to laying period. The 8h-fed and 85%-fed groups were inclined to have lower levels of progesterone and estradiol than the ad libitum group. Testosterone content, on the other hand, showed no certain pattern of change with either the age or feeding program. Whereas the feed restriction did not affect the age, body weight, and egg weight at the onset of lay, it resulted in delay on age, a heavier body weight and a larger egg size at the 50% egg production. The effect on hen-day egg production was obvious. From the onset of lay to 40 weeks of age, the ad libitum, 8h-fed, and 85%-fed chickens laid 89.7, 61.0, and 49.9 eggs/bird, respectively (p<0.05). The depressing effect on egg production was lifted once the restricted birds were turned to the full feeding. The cumulative number of eggs produced during the period from 40-72w. of the 8h-fed turned full-fed, and 85%-fed turned full-fed groups were 143.9 and 155.2 eggs/bird, respectively compared with the 128.0 egg/bird of the ad libitum group (p<0.05). A similar depressing effect of feed restriction was also true on the feed conversion rate (kg. feed consumed/kg. egg produced). |
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). |
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หัวเรื่อง:ผลการใช้มันเส้นเป็นหลักในสูตรอาหารขุนแกะ ผู้เขียน:Sumon Pojun, Prasert Pojun, Sawakon Rojanastid สื่อสิ่งพิมพ์:pdf Abstract The study was aimed at supplementation levels of concentrate composing of dry cassava chip as basal feed for lambs receiving fresh para-grass ad libitum. Eighteen weaning lambs were divided into 3 groups of 6 animals each ( 4 males, 2 females ). Each group was randomly allocated to supplemented concentrate at 200, 400 and 600 gm/head/day until 30 kg body weight. The result showed that average daily gain and feed conversion ratio of lambs fed with the above diets were 73.13, 111.52,131.15 gm/day and 8.17, 6.68 and 6.42, respectively. Although there was no significant differences in average daily gain, feed conversion ratio, fattening period and carcass quality between group 2 and group 3, lambs received 600 gm concentrate/head/day showed the best daily gain (131.15 gm/day ), feed conversion ratio ( 6. 42 ) and fattening period ( 137 days ). Costs of feeding per 1 kg. liveweight gain were 12.00, 12.34 and 12.89 baht for the respective groups 1, 2 and 3. |
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 Researcherนางสาว สดใส ช่างสลักที่ทำงาน:ศูนย์วิจัยข้าวโพดและข้าวฟ่างแห่งชาติ คณะเกษตร สาขาที่สนใจ:วัชพืชในข้าวโพด, การทดลองข้าวโพดข้าวฟ่างในไร่กสิกร, การผลิตพืช Resume |
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