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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Genetic Parameters for Weaning Weight, Weaning Hip Height and Weaning Body Length of Crossbred Beef Cattle in Thailand) ผู้เขียน: Tamirat Tessema,  ดร.พรรณวดี โสพรรณรัตน์, รองศาสตราจารย์ , ดร.ศรเทพ ธัมวาสร, ศาสตราจารย์ , ทวีพร เรืองพริ้ม สื่อสิ่งพิมพ์:pdf AbstractGenetic parameters for weaning weight (WWT), weaning hip height (WHH) and weaning body length (WBL) of crossbred beef cattle among the Thai Native, Brahman and Charolais breeds raised in central Thailand were estimated using a derivative-free, restricted maximum likelihood algorithm. Multivariate animal models were employed to estimate the direct heritability (h2) of WWT, WHH and WBL and to estimate the maternal heritability (m2), the direct-maternal genetic correlation (ram), and the fraction of variance due to maternal permanent environmental effect (c2) only for WWT. The model fi tted contemporary group (CG) and sex as fi xed effects and weaning age and breed fractions of Brahman and Charolais as fi xed covariates. Estimates of h2 ranged from 0.54 to 0.68, 0.68 to 0.93 and 0.33 to 0.48 for WWT, WHH and WBL, respectively. The estimates of m2, ram and c2 for WWT ranged from 0.20 to 0.23, -0.38 to -0.36 and 0.00 to 0.08, respectively. The direct genetic correlations between traits ranged from 0.59 to 0.98. The high genetic correlations between traits indicated the possibility of performing selection for WWT based on the information from WHH and WBL. A simple direct genetic effect model was determined to be appropriate for analyzing the current data set based on the likelihood ratio test but the estimates of h2 for traits might bias upward. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Genetic Parameters for Birth Weight and Weaning Weight in Anglo-Nubian, Saanen, Thai Native and Crossbred Goats) ผู้เขียน:จิตติมา กันตนามัลลกุล, ดร.พรรณวดี โสพรรณรัตน์, รองศาสตราจารย์, Monchai Duangjinda, สุวิทย์ อโนทัยสินทวี, ดร.ศรเทพ ธัมวาสร, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractGenetic parameters were estimated for birth weight and weaning weight in Anglo-Nubian, Saanen, Thai native and crossbred goat populations maintained at the Yala Livestock Research and Breeding Center. Records on 2,845 kids descended from 54 bucks and 615 does from 1995 to 2005 were included in the analysis. Analyses were carried out using the DFREML algorithm and fitting four different animal models that included or ignored maternal genetic and permanent environmental effects. In Model 1 only the direct genetic effect was fitted. The maternal permanent environmental effect was added in Model 2, while the maternal genetic effect was added in Model 3. In Model 4, the maternal genetic and permanent environmental effects were included from Model 1. The genetic covariance between the direct and maternal effects was included in Models 3 and 4. The estimates of direct heritability increased when the maternal genetic effect was added with the direct and maternal covariance. The estimates of maternal heritability slightly decreased when the maternal permanent environmental effect was added to the model. The direct-maternal genetic correlation estimates were negative, whereas estimates of the maternal permanent environmental variance as a proportion of phenotypic variance were low. The likelihood ratio test showed that Model 4 was the best for birth weight and Model 3 was the best for weaning weight. |
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ที่มา:การประชุมทางวิชาการของมหาวิทยาลัยเกษตรศาสตร์ ครั้งที่ 47หัวเรื่อง:แนวโน้มความสามารถทางพันธุกรรมสำหรับน้ำหนักแรกเกิด และหย่านมของโคเนื้อลูกผสมระหว่างพันธุ์พื้นเมืองไทย บราห์มัน และชาร์โรเลส์ |
ที่มา:Kasetsart Journal (Natural Science)(วารสารวิทยาสารเกษตรศาสตร์ สาขาวิทยาศาสตร์)หัวเรื่อง:Effect of genetic polymorphism of bovine growth hormone gene on preweaning growth traits in a Thai multibreed beef population |
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 Researcherนาง ทวีพร เรืองพริ้มที่ทำงาน:ศูนย์วิจัยและพัฒนาทางสัตวศาสตร์ (การผลิตกระบือและโค) ภาควิชาสัตวบาล คณะเกษตร กำแพงแสน สาขาที่สนใจ:การผลิตสัตว์ และอาหารสัตว์กระเพาะรวม Resume |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effect of Genetic Polymorphism of Bovine Growth Hormone Gene on Preweaning Growth Traits in a Thai Multibreed Beef Population) ผู้เขียน:ชินา สุภากรณ์, Supamit Mekchay, ดร.วรวิทย์ สิริพลวัฒน์, รองศาสตราจารย์ , ดร.พรรณวดี โสพรรณรัตน์, รองศาสตราจารย์, ดร.ศกร คุณวุฒิฤทธิรณ, รองศาสตราจารย์ , ดร.ศรเทพ ธัมวาสร, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractGrowth hormone (GH) gene was investigated as a candidate gene for birth weight (BW) and weaning weight (WW) in a population of multibreed beef cattle of three crossbreds. Beef cattle involved consisted of Charolais, Brahman and Thai local native with different breed fractions. Screening polymorphisms within bovine GH gene was performed by using a single strand conformation polymorphism (SSCP) method and the result was confirmed by a sequencing analysis. To identify polymorphic sites within the bovine GH gene, primers were designed revealing 6 PCR fragments (GH1 to GH6). Four single nucleotide polymorphisms (SNPs) were found in the bovine GH gene of this cattle population. Two SNPs were found within the GH1 and GH2 fragments at nucleotide position 303 and 218 bp. The other two SNPs were located at position 208 and 388 bp of the GH5 fragment. No polymorphisms were found in the GH3, GH4 and GH6 fragments, respectively. The genotypic frequencies of GH1 were found to be 5.40, 85.40 and 9.20 percents for A1A1 A1B1 and B1B1, respectively. The genotypic frequencies of GH2 were found to be 90.00, 8.46 and 1.54 percents for A2A2, A2B2 and A2C2, respectively. The GH5 were found to be 2.31, 30.77, 17.69, 13.85 and 35.38 percents for A5A5, A5B5, B5C5, B5D5 and C5D5 genotypes, respectively. Considering haplotype of four polymorphic sites, only 17 haplotypes were identified in this population. The 212 and 215 haplotypes were found at a high frequency. Effect of four SNPs in each region genotype regions of GH for BW and WW indicated that GH1 influenced both BW and WW. However, the GH5 influenced only for BW (P<0.01). Animals with B1B1 of GH1 had the highest BW and WW but animals with A1A1 had the lowest of both traits (P<0.05). Animals with C5D5 of GH5 had the highest BW but animals with A5A5 had lowest BW (P<0.05). Moreover, haplotype of four SNPs were analysed and the results showed the animals with 313 and 325 haplotypes obtained high BW and WW, respectively (P<0.05). However, animals with 111 and 234 haplotypes obtained low BW and WW, respectively (P<0.05). Therefore, the producers should select animals with B1B1 and C5D5 genotypes to obtain high BW and WW. Moreover, mating system should be considered because intra- and inter-genic polymorphic regions or haplotypes has an effect on BW and WW. |
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