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ผลงานตีพิมพ์ในวารสารวิชาการPopulation Management of Samia cynthia ricini Boisduval (Lepidoptera: Saturniidae) by Eggs Refrigeration and Its Effect on Hatchability, Development, and Fecundityผู้แต่ง: Nurkomar, I., Trisnawati, D.W.,  Dr.Narisara Piyasaengthong, Assistant Professor , Kirana, P.N., วารสาร: 
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Dietary Sodium Bicarbonate Supplementation on Eggshell Quality and Hatchability in Thai Native Hens) ผู้เขียน:ดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์ , Ratana Chotesangasa สื่อสิ่งพิมพ์:pdf AbstractAn investigation was conducted on Thai native hens to determine the effects of dietary sodium bicarbonate (NaHCO3) supplementation on egg production, egg and eggshell quality, fecal moisture content, plasma sodium, and hatchability performance. Two hundred and forty of 24 wk-old hens were used in this study. The birds were housed in individual cage and received 1 of 3 experimental diets. The 3 experimental diets were control layer diet, the control diet added with 1% NaHCO3, and the control diet added with 1.5% NaHCO3. The experiment was conducted for 24 weeks. There were no significant differences in feed consumption, egg weight, yolk weight, albumen weight, Haugh units or fecal moisture content among the three bird groups throughout the experimental period. However, the birds in the two groups having received the diet supplemented with NaHCO3 gave a significantly higher level of yolk color, shell weight, and shell thickness than the control hens transiently (P<0.05). Likewise, the hens received the diet added with NaHCO3 had a higher level of plasma sodium concentrations than the birds fed with control diet at 32 and 36 wk of age. A smaller, but still significant, increase in plasma pH was also observed in the fowls having consumed the diet supplemented with 1.5% NaHCO3 at 28 wk of age (P<0.05). Hatchability, viability (hatchability of fertile eggs), and body weight of the chick at hatching were not affected by the experimental diets (P>0.05). The results indicated that at moderate temperatures eggshell quality of Thai native hens could be improved by dietary supplementation with 1.5% NaHCO3. This suggested that the response was associated to bicarbonate intakes. However, the beneficial effect was transient that would be resulted from the hens having no access to feed during the dark period, irrespective of bicarbonate content, the time during which eggshell formation occured. Hatchability and viability of chicken embryos were not evident. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Red Light Illumination on Productivity, Fertility, Hatchability and Energy Effi ciency of Thai Indigenous Hens) ผู้เขียน:ดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์, Pannapat Guntapa สื่อสิ่งพิมพ์:pdf AbstractThis study was conducted to determine the effects of red light exposure on the productivity, fertility and hatching characteristics in Thai native hens (Gallus domesticus). A total of 120 birds aged 18 wk were housed in an open-sided shed and exposed to one of the following lighting treatments: 1) natural daylight supplemented with fl uorescent light (Control), 2) natural daylight supplemented with red light (NR) and 3) red light as the sole light source (R). The red light was produced by light- emitting diodes. All treatments were provided with a daily light:dark photoperiod of 16:8 hr over a 28-week egg-laying period, and there were four replicate pens of 10 hens for each treatment. Photostimulation of the light sources was initiated at age 18 wk and any subsequent effects on the live performance and reproductive traits were observed during the experimental period. Feed and water were available at all times. Body weights, feed consumption and mortality rates were similar among the treatment groups. The age at fi rst egg of the NR birds (130.7 d) was comparable to that of the R birds (129.2 d) which was signifi cantly less than that of the control hens (134.7 d). During the fi rst week of the laying period, R hens produced more eggs than did hens in the control treatment (P < 0.05), whereas the NR birds exhibited an intermediate value between those groups. At 2 wk after photostimulation, the serum estradiol concentration was signifi cantly higher for hens in the R treatment compared to those of the control and NR treatments. The hematocrit values of the birds in the R treatment tended to be lower than those of the other two treatments in some periods of the study. During the lighting period from weeks 6 to 8, a signifi cantly improved feed conversion ratio was observed in the R and NR treatments compared to that of the control treatment. No signifi cant differences in egg weight, egg and eggshell quality or any parameters of hatching occurred between the R and control groups. The weights of the ovary, pituitary gland, spleen and the abdominal fat were similar for all light treatments. It was concluded that photostimulation by red light resulted in an acceleration of sexual development in Thai native hens compared to hens exposed to full-spectrum lighting; however, live performance, egg production, egg and eggshell quality, and fertility were not affected whatever the light treatment. The light-emitting diode lighting regimens could be benefi cial for energy conservation and the reduction of rearing costs in laying hens. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Using Ground Eggshells as a Dietary Calcium Source on Egg Production Traits, Hatching Performance and Eggshell Ultrastructure in Laying Hens) ผู้เขียน:ดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractA 10 wk trial was conducted to investigate the effect of using ground, sterilized eggshell as a calcium source in the diet of laying hens. Egg production, egg and eggshell quality, hatching characteristics and eggshell ultrastructure were evaluated. A total of 144 hens aged 25 wk were housed in floor pens, located in a conventional open-sided layer shed. The birds were randomly divided into three groups, each group represented by four replicates, consisting of twelve birds each. Group 1 (Control) was provided with a layer ration that contained all the calcium carbonate as fine limestone, whereas Groups 2 and 3 were placed on a layer diet with 50 and 100%, respectively, of the limestone substituted with ground eggshells. The birds were given free access to food and water, and exposed to a 16L:8D photoperiod daily. Throughout the entire 10 wk test period, body weight, egg production, egg weight and egg quality of the three bird groups were not significantly (P > 0.05) different. Eggshell weight, eggshell thickness and egg specific gravity were not affected by the treatment diets. Hatching performance was determined at 4 and 8 wk after feeding the experimental diet. There were no significant differences in average fertility, hatchability, egg weight loss, chick yield and hatchling weight among the bird groups. In addition, there were no significant differences between treatments in growth and livability of chicks aged 1 wk. Scanning electron microscopy was used to study the morphology of the eggshell. The photographs illustrated a little variation in the formation of the mammillary layer of the shell produced by hens fed diets containing eggshell calcium. Neither density nor diameter of the mammillary knobs were affected by the treatments. The results indicated that eggshells can be fully utilized as a calcium source in layer diets without detrimental effects on productive performance, fertility, hatchability, chick quality and the fine structure of the eggshell. |
หัวเรื่อง:วงจรชีวิตและวิธีเพาะเลี้ยงหนอนแดง (Chironomus plumatisetigerus) ในห้องทดลอง ผู้เขียน:Chaiow Kuvangkadilok สื่อสิ่งพิมพ์:pdf AbstractThe adults of Chironomus plumatisetigerus can be bred in the laboratory for at least 9 generations, by using mating cages 37x37x37 cm3, 30.5x30.5x30.5 cm3, 20.5x20.5x20.5 cm3 and 10.5x10.5x10.5 cm3 in size. The adults will mate readily in a cage 10.5x10.5x10.5 cm3 while only some successful matings between individuals have been obtained in the larger cages. In addition, the number of males in mating cages seemed to affect the success of crosses. For the parental crosses and the F1self-crosses, at least 25 males were required, while for the self-crosses of F2 and the following generations only 10 males were needed. Laboratory egg masses were collected and checked for fertility and hatchability. The fertility and hatchability of the egg masses of F1 and the other generations were rather high (>93%), therefore, the laboratory conditions did not seem to affect the breeding mechanisms of Ch. Plumatisetigerus. The life cycle of Ch. Plumatisetigerus comprises of fourstages, as found in other dipterous insects, of which the longest is the larval stage. The female larvae have larger head capsule structures as compared to those of the male, hence it seems that the male and female larvae have different growth rates. |
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 Researcherนางสาว วาสนา อากรรัตน์ที่ทำงาน:สถานีวิจัยประมงคลองวาฬ (ศูนย์บริหารงานวิจัยเเละสนับสนุนวิชาการ คณะประมง) คณะประมง สาขาที่สนใจ:เทคโนโลยีการเพาะเลี้ยงแพลงก์ตอนสำหรับใช้ในการอนุบาลลูกสัตว์น้ำ Resume |
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 Researcherดร. วุฒิชัย อ่อนเอี่ยมที่ทำงาน:สถานีวิจัยประมงคลองวาฬ (ศูนย์บริหารงานวิจัยเเละสนับสนุนวิชาการ คณะประมง) คณะประมง สาขาที่สนใจ:เทคโนโลยีการเพาะเลี้ยงสัตว์น้ำ, คุณภาพน้ำในการเพาะเลี้ยงสัตว์น้ำ Resume |
 Researcherนางสาว รุ่งทิวา คนสันทัดที่ทำงาน:สถานีวิจัยประมงคลองวาฬ (ศูนย์บริหารงานวิจัยเเละสนับสนุนวิชาการ คณะประมง) คณะประมง สาขาที่สนใจ:การเพาะอนุบาลลูกสัตว์น้ำชายฝั่ง, คุณภาพน้ำกับการเพาะเลี้ยงสัตว์น้ำ Resume |
 Researcherนาย ปิยะวัฒน์ พรหมรักษาที่ทำงาน:สถานีวิจัยเพื่อการพัฒนาชายฝั่งอันดามัน (ศูนย์บริหารงานวิจัยเเละสนับสนุนวิชาการ) คณะประมง สาขาที่สนใจ:การพัฒนาและฟื้นฟูทรัพยากรประมงชายฝั่ง, การจัดการน้ำเพื่อการเกษตรเชิงบูรณาการ, การพัฒนาศักยภาพการผลิตประมงชายฝั่ง Resume |
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