Genetic parameters for resistance against Flavobacterium columnare in Nile tilapia Oreochromis niloticus (Linnaeus, 1758)          下载免费PDF全文

P Wonmongkol  S Sukhavachana  K Ampolsak  P Srisapoome  T Suwanasopee  S Poompuang 《Journal of fish diseases》2018,41(2):321-328

Columnaris disease is a major cause of mortality in tilapia hatcheries and commonly occurs during the summer season in Thailand. One way of reducing the problem is by selective breeding for increased disease resistance. The objective of this study was to estimate quantitative genetic parameters for resistance against columnaris in the Chitralada 4 strain of Nile tilapia. Data from 43 full‐sib families (2,580 records) of fry (age = 32 ± 4 days post‐hatch) were used in the analyses. Initially, fry were subjected to bath challenge with Flavobacterium columnare (LD₅₀ concentration = 1.2 × 10⁶ CFU/ml) for 14 days. Disease resistance was defined as the number of days from challenge until death (DD) or as a binary trait (dead/alive) on day 14. Linear animal and sire‐dam models were used for DD, while threshold animal, threshold sire‐dam, binary linear animal and binary linear sire‐dam models were used for binary outcomes. Covariate effect of age, fixed effect of challenge day and random effects of the individual animals or sires and dams were included in the models. Mean survival was 32.4 ± 11.6%, and survival rates of the best and poorest families were 70% and 8%, respectively. The highest estimate of heritability (0.30 ± 0.025) was obtained under the threshold sire‐dam model. Heritability estimates for DD (0.16 ± 0.034 and 0.17 ± 0.046) were comparable to those obtained from the threshold animal (0.15 ± 0.031) and the binary linear (0.14 ± 0.045 and 0.15 ± 0.044) models. The linear animal and sire‐dam models for DD and the threshold sire‐dam models performed equally with similar values of r_EBV (0.629, 0.628 and 0.627) and accuracy of selection (0.793, 0.793 and 0.791). This study reveals the potential of selective breeding to increase disease resistance to F. columnare in the studied population of Nile tilapia.  相似文献   

Effect of daily fluctuations in ambient temperature on reproductive failure traits of Landrace and Yorkshire sows under Thai tropical environmental conditions     

Teerapong Jaichansukkit  Thanathip Suwanasopee  Skorn Koonawootrittriron  Padet Tummaruk  Mauricio A. Elzo 《Tropical animal health and production》2017,49(3):503-508

The aim of this study was to determine the effects of daily ranges and maximum ambient temperatures, and other risk factors on reproductive failure of Landrace (L) and Yorkshire (Y) sows under an open-house system in Thailand. Daily ambient temperatures were added to information on 35,579 litters from 5929 L sows and 1057 Y sows from three commercial herds. The average daily temperature ranges (ADT) and the average daily maximum temperatures (PEAK) in three gestation periods from the 35th day of gestation to parturition were classified. The considered reproductive failure traits were the occurrences of mummified fetuses (MM), stillborn piglets (STB), and piglet death losses (PDL) and an indicator trait for number of piglets born alive below the population mean (LBA). A multiple logistic regression model included farrowing herd-year-season (HYS), breed group of sow (BG), parity group (PAR), number of total piglets born (NTB), ADT1, ADT2, ADT3, PEAK1, PEAK2, and PEAK3 as fixed effects, while random effects were animal, repeated observations, and residual. Yorkshire sows had a higher occurrence of LBA than L sows (P?=?0.01). The second to fifth parities sows had lower reproductive failures than other parities. The NTB regression coefficients of log-odds were positive (P?<?0.01) for all traits. Narrower ranges of ADT3 increased the occurrence of MM, STB, and PDL (P?<?0.01), while higher PEAK3 increased the occurrence of MM, STB, PDL, and LBA (P?<?0.001). To reduce the risk of reproductive failures, particularly late in gestation, producers would need to closely monitor their temperature management strategies.  相似文献   

Screening of in vitro nutrient digestibility coefficients of selected insect meals in broiler chickens,black-meat chickens and quails     

Attawit Kovitvadhi  Pipatpong Chundang  Nichaphon Pliantiangtam  Karun Thongprajukaew  Chanin Tirawattanawanich  Thanathip Suwanasopee  Skorn Koonawootrittriron 《Journal of animal physiology and animal nutrition》2021,105(2):305-315

The objective of this study is to identify potential insect species comparing with commonly used protein sources based on efficiency of the in vitro digestibility on dry matter (DMd), organic matter (OMd) and crude protein (CPd) in broiler chickens, black-meat chickens (Native breed) and quails. Each of gastric mucosa, pancreas and duodenal mucosa were obtained from proventriculus, pancreas and duodenum, respectively. Crude digestive enzyme extracts (CTE) were extracted from these organs to perform in vitro digestibility. Eighteen insect samples and six commonly used protein sources were served as substrates which were evaluated on DMd, OMd and CPd in triplicate for each substrate. The CTE from gastric mucosa was used to simulate proventriculus, whereas small intestine was simulation by adding the CTE from pancreas and duodenum. The large variation of chemical composition between insect meals was presented. For commonly used protein sources, animal proteins were higher on digestibility than plant proteins (p < .001). Quails represented a great potential to digest insect meals comparing other animals. Based on CPd results, there were potential insect species for broiler chickens (Achroia grisella: AG, Tenebrio molitor: TM and Musca domestica), black-meat chickens (Patanga succincta, TM and AG) and quails (Hermetia illucens, Acheta domesticus and Locusta migratoria; p < .001). The evidences from this study suggest that these insect species contain a great potential to use as alternative protein sources promoting an animal production with sustainability. However, the in vivo experimentation must be performed to confirm in further study.  相似文献   

Genetic variation of avirulence genes (AVR-Pi9, AVR-Pik,AVR-Pita1) and genetic diversity of rice blast fungus,Pyricularia oryzae,in Thailand     

Thanathip Sutthiphai  Katanyutita Damchuay  Ram Chandra Neupane  Apinya Longya  Tanee Sriwongchai  Pattavipha Songkumarn  Nonglak Parinthawong  Kulchana Darwell  Chatchawan Jantasuriyarat 《Plant pathology》2022,71(2):322-333

Genetic variation of the rice blast (Pyricularia oryzae) population in Thailand was investigated based on the nucleotide sequence of three avirulence genes, AVR-Pi9, AVR-Pik, and AVR-Pita1. Sixty rice blast isolates were collected from rice-growing areas around Thailand. Gene-specific primers were used to amplify these AVR genes and AVR-Pi9, AVR-Pik, and AVR-Pita1 were detected in 60, 57, and 23 isolates, respectively. Based on the AVR-Pi9 sequences, we identified one rice blast isolate containing an amino acid change from glutamic acid to aspartic acid. Moreover, two rice blast isolates had identical sequences to the rice blast strain originating in Japan, indicating a potential movement of this isolate from Japan to Thailand. Three AVR-Pik alleles were found, including AVR-PikA (3.51%), AVR-PikD (71.93%), and isolates with two copies of AVR-PikD and AVR-PikF (24.56%). AVR-PikA and AVR-PikF are virulent to Thai rice variety Jao Hom Nin. Six haplotypes of AVR-Pita1 were identified with one deletion and 12 amino acid substitutions. This study revealed that different AVR genes in Thai rice blast populations have different levels of genetic variation: AVR-Pi9 and AVR-Pik genes have a relatively low genetic diversity, while the AVR-Pita1 gene has high genetic diversity. We found AVR-Pi9 was not under selection pressure, while AVR-Pita1 was under purifying selection pressure. In addition, geographic location has influenced the distribution of genetic variation of AVR-Pita1. The information obtained from this study is valuable for the future development of breeding strategies for rice blast resistance in Thailand.  相似文献   

Genetic relationships between length of productive life and lifetime production efficiency in a commercial swine herd in Northern Thailand          下载免费PDF全文

Udomsak Noppibool  Mauricio A. Elzo  Skorn Koonawootrittriron  Thanathip Suwanasopee 《Animal Science Journal》2017,88(2):213-221

Genetic parameters and trends for length of productive life (LPL), lifetime number of piglets born alive per year (LBAY), lifetime number of piglets weaned per year (LPWY), lifetime litter birth weight per year (LBWY) and lifetime litter weaning weight per year (LWWY) were estimated using phenotypic records of 3085 sows collected from 1989 to 2013 in a commercial swine farm in Northern Thailand. The five‐trait animal model included the fixed effects of first farrowing year‐season, breed group and age at first farrowing. Random effects were animal and residual. Heritability estimates ranged from 0.04 ± 0.02 for LBWY to 0.17 ± 0.04 for LPL. Genetic correlations ranged from 0.66 ± 0.14 between LPL and LBAY to 0.95 ± 0.02 between LPWY and LWWY. Spearman rank correlations among estimated breeding values for LPL and lifetime production efficiency traits tended to be higher for boars than for sows. Sire genetic trends were negative and significant for all traits, except for LPWY. Dam genetic trends were positive and significant for all traits. Sow genetic trends were mostly positive and significant only for LPWY and LBWY. Improvement of LPL and lifetime production efficiency traits will require these traits to be included in the selection indexes used to choose replacement boars and gilts in this population.  相似文献