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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. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Change in Body Weight and Ovary Weight of Pre-lay Pullets Fed Maize-soy Based Diet Supplemented with an Exogenous Microbial Enzyme) ผู้เขียน:Navaporn Chauynarong, Paul Iji, ดร.สุภาพร อิสริโยดม, รองศาสตราจารย์ , Mingan Choct, Lene Mikkelsen สื่อสิ่งพิมพ์:pdf AbstractThe experiment was conducted to examine the benefits of supplementing maize-soy diets with a composite microbial enzyme, Allzyme SSF?, for laying hens at the pullet stage. Seven hundred and twenty (720) 12-week old Isa Brown pullets were treated in the different level of protein content diets. The three diets contained 120, 140 and 160 g CP/kg, each fed with or without a microbial enzyme supplement, Allzyme SSF? (200 g/ton), in a 3 x 2 factorial design. The three main diets were designated as Low-CP, Mid-CP and High-CP, respectively. In experiment, feed intake from 12 to 16 weeks of age was unaffected by the enzyme supplement, except at the lowest protein content (P<0.05). Feed intake was, however, affected by the enzyme supplement between 16 and 20 weeks (P<0.001) and over the entire trial period (P<0.05). Body weight at 16 weeks of age was reduced (P<0.05) on the control lowprotein diet. Feed conversion ratio was not affected by dietary protein content or through supplementation with the microbial enzyme. The relative weight of the ovary was reduced (P<0.01) on the low protein control diet. Onset of lay occurred from about 23 weeks of age, after the hens were already on a commercial diet but effects of previous dietary treatments on early egg production were noticeable. The current results suggest that supplemental Allzyme SSF is beneficial to growing pullets on low protein diets, and the supplement supports egg production in early lay. |
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ที่มา:การประชุมทางวิชาการของมหาวิทยาลัยเกษตรศาสตร์ ครั้งที่ 49: สาขาพืชหัวเรื่อง:การศึกษาพืชอาศัยในการวางไข่ของมวนตัวห้ำเพลี้ยไฟ Wollastoniella rotunda Yasunaga และ Miyamoto (Hemiptera: Anthocoridae) |
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ผลงานตีพิมพ์ในวารสารวิชาการMultidrug resistant Escherichia coli Harboring Extended-spectrum ฮฒ-Lactamase-encoding genes isolated from clinically healthy pigsผู้แต่ง:Lay, K.K., Torio, H.E., Bitrus, A.A., Mala, W., Mrs.Nuananong Sinwat, Assistant Professor, Chuanchuen, R., วารสาร: 
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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. |
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