Search Result of "carcass yield"

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ผลงานตีพิมพ์ในวารสารวิชาการ

Effects of Dietary Energy and Methionine Sources on Productive Performance and Carcass Yield in Broiler Chickens

ผู้แต่ง:ImgChoawit Rakangtong, ImgDr.Chaiyapoom Bunchasak, Professor,

วารสาร:

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Dietary Energy and Methionine Sources on Productive Performance and Carcass Yield in Broiler Chickens)

ผู้เขียน:Imgดร.เชาว์วิทย์ ระฆังทอง, ผู้ช่วยศาสตราจารย์, Imgดร.ชัยภูมิ บัญชาศักดิ์, ศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

An experiment was conducted to determine the effects of two dietary energy sources (corn and cassava) and three types of dietary methionine (Met) supplementation (without methionine supplementation, liquid DL-methionine hydroxy analog-free acid (LMA) supplementation and dry DLmethionine (DLM) supplementation) on the growth performance and carcass yield of broiler chicks during 0-6 weeks of age. The experiment was a completely randomized design in a 2 ? 3 fractional factorial. Nine hundred commercial male broiler chicks (Ross strain) were divided into six groups, and each group consisted of six replicates of 25 chicks each. The chicks were kept in floor pens, and water and feed were supplied ad libitum throughout the experimental period. The six experimental diets were: 1) corn-soybean diet deficient in methionine, 2) corn-soybean diet supplemented with DLM, 3) cornsoybean diet supplemented with LMA, 4) cassava-soybean diet deficient in methionine, 5) cassavasoybean diet supplemented with DLM and 6) cassava-soybean diet supplemented with LMA. The experiment assumed that 100 units of liquid LMA could be replaced by 88 units of DLM. Weight gains, feed conversion ratio (FCR) and average daily gain (ADG) in chicks fed the diets supplemented with LMA or DLM were significantly greater than those in chicks fed the methionine-deficient diets (P<0.05). The weights of the eviscerated carcass, pectoralis major, pectoralis minor and wings were increased by DLM and LMA supplementation (P<0.05). Dietary energy sources analysis indicated that the meat yield of chicks fed the cassava-soybean diet was lower than for chicks fed the corn-soybean diet, while the abdominal fat level was higher. The results indicated that chicks fed the cassava-soybean base diet showed lower productive performance than chicks fed the corn-soybean base diet. The effect of methionine source (DLM and LMA) on the growth performance and carcass yield of chicks was not significantly different. In conclusion, adding methionine could prevent the negative impact of amino acid imbalance and improve the energy utilization of chicks fed on a diet based on cassava-soybean.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 044, Issue 4, Jul 10 - Aug 10, Page 574 - 581 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Green or a Combination of Green and Blue Monochromatic Light on Growth, Carcass Yield, the Heterophilto- Lymphocyte Ratio and Eye Morphology of Thai Indigenous Ch

ผู้เขียน:Imgดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

In total, 240 one day old Thai-native chickens (Gallus domesticus) were housed in floor pens, located in a light-proof shed and exposed to one of the following lighting treatments: 1) white fluorescent light throughout the 16 wk of the experimental period (WF), 2) green light provided by a light emitting diode (LED) throughout the experimental period (GLED) and 3) green LED light for the first 3 wk then switching to blue LED light provided for the remaining 13 wk (G-BLED). All treatments were provided with a daily light:dark photoperiod of 23:1 hr over the 16 wk growing period, and there were four replicate pens of 20 straight-run chickens for each treatment. Live performance and the mortality rate were recorded during the experimental period. Feed and water were available at all times. Cumulative feed consumption, feed conversion ratios and mortality rates were similar among the treatment groups. At 6 wk of age, the body weight of the GLED birds was significantly heavier than that of the WF birds, whereas the G-BLED birds had an intermediate value compared with those of the other two treatment groups. Whole carcass and carcass yield characteristics of male chickens processed at age 16 wk were similar for all light treatments, except for relative weights, expressed as percentages of body weight and lean carcass weight, of the liver where the liver relative weights of the WF treatment group were significantly greater than those of the GLED treatment group. There were no significant differences among the treatment groups for weights of the spleen, thymus and bursa of Fabricius. Neither the hematocrit value nor eye morphology of the male birds measured at age 16 wk were influenced by the light treatments. However, the WF birds had a higher heterophil-to-lymphocyte ratio (P < 0.05) compared with the GLED and G-BLED birds. It was concluded that green or blue light has little effect on growth stimulation and the carcass yield of Thai-native chickens without any deleterious effect on eye morphology. The results suggested that the light spectra reduced aggression and activity in the birds. Nevertheless, an additional effect of light intensity may exist and should not be excluded. The LED lighting regimens could be beneficial for energy conservation, the reduction of rearing costs and the improvement of the well-being of the birds.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 048, Issue 3, May 14 - Jun 14, Page 412 - 424 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:การศึกษาการเจริญเติบโตและผลผลิตซากของไก่เบตง เปรียบเทียบกับไก่พื้นเมืองและไก่ลูกผสมเบตง x พื้นเมือง

ผู้เขียน:ImgNirat Gongruttanannu, ImgRatana Chotesangasa

สื่อสิ่งพิมพ์:pdf

Abstract

This experiment was conducted to determine the growth rate and carcass yield of Betong (B) compared with those of crossbred Native (male) x Betong (female) (NB), crossbred Betong (male) x Native (female) (BN), and Native chickens (N). Day-old straight chickens were placed on battery cages and were slaughtered at 16 weeks of age. Body weight (BW) of B was consistently greater than (P<0.05) the other 3 breeds for the duration of the study, from hatching (32.80) to 16 weeks (2.486 kg) while the average cumulative feed conversion ratios for these periods were 1.80 and 3.79, respectively. BW of NB and BN were similar through the study even though at hatching BN had BW lower than NB (28.30 versus 32.40 g, respectively). Weights of B of whole carcass and carcass parts B were considerably greater than those of (P<0.05) the others, with this difference pronounced in both sexes. Yield (expressed on a percentage of chilled carcass weight basis) of pectoralis major of B in male (14.67%) was greater than (P<0.05) those of the other breed, and the same difference was shown in female (17.10%). However, there was no difference in yield of pectoralis minor among the 4 breeds of both sexes. Thigh yield of B, NB and BN in male were 18.15, 18.74 and 18.40% respectively, greater than (P<0.05) that of N (17.17%). Both yield of drumsticks and wings of B in male were fewer than the others whereas there was no difference in female. Yield of abdominal leaf fat was affected by sex, the greater yield was in female, whereas there was no difference among the 4 breeds of chickens.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 030, Issue 3, Jul 96 - Sep 96, Page 312 - 321 |  PDF |  Page 

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ที่มา:วารสารวิทยาศาสตร์เกษตร

หัวเรื่อง:ผลของการเสริมดีแอลเมทไธโอนีนไฮดรอกซีอะนาลอคในรูปกรดอิสระเพื่อเป็นกรดอินทรีย์ในน้ำดื่ม ต่อจุลินทรีย์ในน้ำดื่ม สมรรถภาพการผลิต และผลผลิตซากของเป็ดเนื้อ

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