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 ผลงานตีพิมพ์ในวารสารวิชาการInterannual variation in transpiration onset and its predictive indicator for a tropical deciduous forest in northern Thailand based on 8-year sap-flow recordsผู้แต่ง: Yoshifuji, N., Komatsu, H., Kumagai, T., Tanaka, N.,  Mr.Chatchai Tantasirin, Assistant Professor , Suzuki, M., วารสาร:  
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ผลงานตีพิมพ์ในวารสารวิชาการInter-annual variation in the response of leaf-out onset to soil moisture increase in a teak plantation in northern Thailandผู้แต่ง:Yoshifuji, N, Igarashi, Y, Tanaka, N, Tanaka, K, Sato, T, Mr.Chatchai Tantasirin, Assistant Professor, Suzuki, M, วารสาร: |
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Short-Term Stressor Effects of Water Deprivation Prior to the Onset of Lay on Subsequent Reproductive Performance of ISA Brown Pullets ) ผู้เขียน:ดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์ , Ratana Chotesangasa สื่อสิ่งพิมพ์:pdf AbstractThe influence of water deprivation prior to the onset of production on sexual maturity and subsequent reproductive performance was investigated in commercial pullets. Three hundred 16-weekold ISA Brown pullets were used in this study. The birds were housed in cages (100 cages of 3 birds/cage) situated in an open sided poultry shed and randomly divided into three treatment groups. The 3 groups were 1) control (received feed with water at all times) 2) dehydrated and 3) dehydrated+NH4Cl. Following an acclimatization period of 4 weeks, the birds in all groups were placed on a commercial layer ration and the treatments began. In the dehydrated and dehydrated+NH4Cl groups, the drinking water was removed completely from the pullets for 48 hours of dehydration but feed available at all times. The water was then returned to the birds following the water withdrawal period, and thereafter until the end of the trial. The pullets in the dehydrated+NH4Cl group were fed on the layer diet supplemented with 1%NH4Cl throughout the experimental period. It was found that feed intake dropped rapidly, by approximately 50%, when the birds were subjected to water deprivation. Neither age at first egg nor at 50-60 % of production was influenced by the interruption of drinking water supply. Little difference in egg weight at first egg was noted between the dehydrated birds and the normally hydrated hens. Pullets deprived of water were slower coming into egg production especially during the first 2 weeks of production period, however, thereafter egg production was similar among all treatment groups with numerical advantages for the normally hydrated hens. There were no carryover effects of water deprivation on subsequent egg weight, albumen weight, Haugh units, yolk weight or yolk color throughout the entire 12 weeks of the test. Body weights were not different either before the treatment or at the end of the study (P>0.05). The results might be interpreted as indicating that an interruption of drinking water supply for 2 days prior to the commencement of egg production induced transient effects of nutrient deficiency resulted in retardation of reproductive development. The acidified layer ration failed to show any positive effects on reproductive performance for the first 12 weeks of lay. The pullets, however, appeared to overcome the detrimental effects as they approached sexual maturity. |
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หัวเรื่อง:ผลของอายุเมื่อเริ่มจำกัดแสงต่อลักษณะการเจริญเติบโตและการให้ไข่ของไก่พื้นเมือง ผู้เขียน:Ratana Chotesangasa, ดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractAn experiment was conducted to study the effect of ages at the onset of light restriction during growing period on growth and laying performance in the native chicken. Four groups of the native chickens were subjected to normal day length (NDL) and to restricted 8 hours/days lighting: started from the age of 10 weeks (LR10), or 12 weeks (LR12), and or 14 weeks (LR14), respectively; before being exposed to the same photoperiod of 15 hours/day from the age of 20 weeks. The results showed no significant difference (P>0.05) in the growth characteristics studied. The NDL, LR10, LR12 and LR14 groups had average body weights at 20 weeks of age of 1.38, 1.37, 1.34 and 1.36 kg; cumulative feed conversion ratios of 6.4, 6.6, 6.4, and 7.0; prelaying mortality rates of 2.5, 1.7, 1.1, and 1.0%, respectively. Age at the onset of light restriction affected sexual maturity of the native chicken. Ages at the onset of lay of the LR14 and LR12 pullets were 159.3 and 161.5 days, respectively, which were earlier than (P<0.05) 164.0 days of the LR10 pullet and 167.3 days of the NDL pullet. Body weights and egg weights at the onset of lay of the four groups were, however, not significantly different (P>0.05). In term of laying performance, the LR12 and LR14 groups showed a trend of having higher hen-day egg production and lower feed conversion ratios (for eggs) than the LR10 and NDL groups. A significant difference (P<0.05) was, however, observed only at some stages of production. Cumulative egg production of the LR12 and LR14 hens were 73.9 and 71.4 eggs/hen/28 weeks, respectively, which were higher than (P<0.05) 65.4 eggs/hen/28 weeks of the LR10 hen, and 64.2 eggs/hen/28 weeks of the NDL hen. Cumulative feed conversion ratios of the LR12 and LR14 groups were 4.9 and 4.8, respectively, which were lower than (P<0.05) 5.4 of the LR10 group and 5.5 of the NDL group. Subsequent laying mortality rate as well as egg weight and egg component were unaffected by light restriction during the growth phase. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Water Deprivation during the Prelaying Period on Eggshell Quality, Wet Droppings and Blood Physiology in Laying Hens) ผู้เขียน:ดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์, Ratana Chotesangasa สื่อสิ่งพิมพ์:pdf AbstractThe influence of water deprivation at the onset of lay on subsequent eggshell quality, fecal moisture content and blood physiology was investigated in ISA Brown pullets. Kidney and bone appearances were also determined at the end of the study. The pullets were randomly divided into 3 groups; control, dehydrated, and dehydrated+NH4Cl groups. The birds in the control group were provided a layer diet with water at all times. At 20 weeks of age, drinking water supply in the dehydrated and dehydrated+NH4Cl groups was removed completely for 48 hours whereas feed was available at all times. Thereafter, the water was provided until the end of the trial. The birds in the dehydrated+NH4Cl group were fed on the control diet added with ammonium chloride (NH4Cl) at a level of 1% throughout the rehydration phase. Water deprivation for 2 days at the onset of lay did not affect eggshell quality throughout the experimental period. An incidence of poor eggshell was observed in the dehydrated+NH4Cl group as evidenced by reduced shell weight and shell thickness at 24 weeks of age (P<0.05). During the 2 days of dehydration, fecal moisture contents were significantly reduced for the birds in the two groups of dehydration. However, the excreta moisture of the birds in these groups increased rapidly as the drinking water was returned and significantly greater than that of the control birds by 6 hours of water replenishment. On Week 8 of rehydration, the increase of the manure moisture was observed again for the dehydrated+NH4Cl hens when compared with the control birds (P<0.05). Interruption of available drinking water increased hematocrit values for the two groups of dehydration during 48 hours of water deprival. Hematocrit values of the hens in these groups, however, were rapidly decreased as the water was reintroduced and significantly reduced on Week 8 of rehydration for the dehydrated hens fed with the acidified diet. Water deprivation was associated with increases in the concentration of sodium in plasma whereas plasma pH was inconsistent and varied among the experimental groups. Decreased humerus weight was observed in the dehydrated+NH4Cl hens necropsied at the end of the study. |
ผลงานตีพิมพ์ในวารสารวิชาการEvaluation of radiographic and genetic aspects of hereditary subluxation of the radial head in Bouviers des Flandresผู้แต่ง:Dr.Jedee Temwichitr, Assistant Professor , Leegwater, P.A.J., Auriemma, E., Van't Veld, E.M., Zijlstra, C., Voorhout, G., Hazewinkel, H.A.W., วารสาร: |
ผลงานตีพิมพ์ในวารสารวิชาการSelected physicochemical properties of rice flour, modified tapioca starch, and their mixtures after a limewater soaking treatmentผู้แต่ง:Pedcharat, K., Dr.Kamolwan Jangchud, Associate Professor , Dr.Anuvat Jangchud, Associate Professor , Dr.Thepkunya Harnsilawat, Assistant Professor , Prinyawiwatkul, W., วารสาร: |
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งานวิจัยการจัดการความเสี่ยงอย่างบูรณาการภายใต้ความแปรปรวนสภาพภูมิอากาศเพื่อเพิ่มศักยภาพการผลิตภาคการเกษตรของภาคตะวันออกของไทย (2013)หัวหน้าโครงการ:ดร.กัมปนาท วิจิตรศรีกมล, รองศาสตราจารย์ ผู้ร่วมโครงการ:ดร.ศุภชาติ สุขารมณ์, ผู้ช่วยศาสตราจารย์ , ดร.วุฒิ หวังวัชรกุล, รองศาสตราจารย์ , นางสาวจิราภัษ อัจจิมางกูร, รองศาสตราจารย์ , ดร.สุวรรณา ประณีตวตกุล, รองศาสตราจารย์ , ดร.เพ็ญพร เจนการกิจ, รองศาสตราจารย์ , ดร.นุชนาถ มั่งคั่ง, ผู้ช่วยศาสตราจารย์ , ดร.จักรกฤษณ์ พจนศิลป์, ผู้ช่วยศาสตราจารย์ , ดร.ภาณุ ตรัยเวช, ผู้ช่วยศาสตราจารย์ , ดร.สันติ แสงเลิศไสว, ผู้ช่วยศาสตราจารย์ แหล่งทุน:ทุนอุดหนุนวิจัยมก. ผลลัพธ์:วารสาร (2) |