جستجوی مقالات مرتبط با کلیدواژه "live weight" در نشریات گروه "علوم دام"

Pedigree and weight trait records belonging to 13633 Baluchi lambs descendent from 308 ram and 3747 dam which were collected in North-east animal breeding center from years 1989 to 2021 were used. Six univariate animal models with fixed (birth year, month, type, sex of lamb and age of dam) and different random effects were fitted to data. Effects of non-genetic factors on weight traits were investigated by Proc GLM of SAS software, and to estimate the variance components the Wombat software was used. All fixed effects had significant effect on the studied traits (P<0.001). Model with additive autosomal, sex linked, and additive maternal random with covariance between direct additive genetic and maternal genetic effect had the lowest AIC and was used for genetic analysis. For birth, weaning, 6, 9 month and yearling weight respectively additive autosomal heritability were 0.16, 0.34, 0.41, 0.49 and 0.56, additive sex-linked heritability were 0.004, 0, 0, 0.007 and 0.005 and maternal heritability were 0.34, 0.38, 0.32, 0.32 and 0.36. Results showed that sex-linked genes possibly have negligible and close to zero additive genetic effects on body weights at initial ages and in comparison, more noticeable effects on body weights at higher ages. In general, it is recommended to use an animal model for genetic analysis of growth traits in sheep, which is able to separate the total genetic variance into three autosomal, sex-dependent and maternal components in order to be more effective in genetic selection.

To investigate the effect of adding garlic and tomato pomace powder to the diet of Ross 308 broiler breeders on production performance, body weight, egg quality traits, and hatchability characteristics, a total of 375 chickens were randomly assigned to five iso-caloric and iso-nitrogenous diets, including four diets containing 0.2 and 0.4% of garlic and tomato pomace dried powder and a control diet with five replicates (15 hens and one rooster per pen). Chicken’s body weight through the trial period (47 to 56 weeks of age), daily egg production (%), average egg weight, and hatching traits were recorded daily. The chickens’ body weight was significantly affected in the first five weeks of the experiment (46 to 51 weeks of age) and during the second five-week period (52 to 56 weeks of age). Adding 0.4% tomato pomace to the diet significantly increased the chickens’ weight (P<0.05). For hatching traits, there were no significant differences between treatments (P>0.05). During the first five weeks of the experiment, the feed conversion ratio decreased in the control and the 0.4% garlic powder treatments compared with the other dietary groups. Also, in the second five weeks of the experiment, control, and garlic powder treatments had a lower feed conversion ratio compared with diets containing tomato powder (P<0.05). Based on the results of the present experiment, it can be concluded that adding garlic powder compared to tomato powder caused better results.

The purpose of this work was to scan chromosome 5 for mapping QTL affecting live weight in an F2 population. A three generation resource population was developed by using two distinct Japanese quail strains, wild and white to map quantitative trait loci underlying hatching weight and growth traits. Eight pairs of white (S) and wild (W) birds were crossed reciprocally and 34 F1 birds were produced. The F1 birds were intercrossed to generate 422 F2 offspring. All of the birds from three generations (472 birds) were genotyped for three microsatellite markers on chromosome 5. Studied traits in this research were live weight from hatch to 5 weeks of age. QTL analysis was conducted applying the line-cross model and the least-squares interval mapping approach. In different situation QTL were live weight at hatch, live detected for weight at 1 week and 2 week. Although was theadditive effect for detected QTL significant but the dominant and tmprinting effects on these traits was not significant and the variance explained by the detected additive QTL effects ranged from 1.1 to 3.6 for different tariats.

This study was carried out investigate the effect of slow-release blous on reproductive efficiency, twinning and weaning weight. 306 female Cashmere Raeini goats were selected randomly and divided into eight treatments. Treatments were: 1and 2) control with and without injection eCG, 3 and 4) Consumption one slow-release blolus with and without injection eCG, 5 and 6) Consumption two slow-release boluses with and without injection eCG and7 and 8) Consumption one minerals and vitamin capsules with and without injection eCG. To synchronize estrus, ciders were installed in goats and eCG hormone injected in a half of goats. The results showed that reproductive efficiency were reduced with slow-release bolus and capsule supplements. But they had significant effect on twinning (p

Calpastatin has been introduced as an effective candidate gene as regards growth efficiency and meat quality traits. Throughout the present study، blood sampling as well as carcass trait measurements were performed on 74 Lori-Bakhtiari sheep and on 40 Zel-Atabay cross-breds from industrial slaughterhouses of Shahrekord and Gorgan cities، respectively. Following DNA extaction، Polymerase Chain Reactions were performed for amplification of a 254 bp fragment containing the entire exon 6 of calpastatin gene. SSCP method along with silver staining were employed for genotyping of PCR products. Fourteen genotypic patterns namely: AA، BB، AB، AC، AD، BE، AF، AG، AH، AI، JJ، AJ، BK، and AL were observed with frequencies of 0. 035، 0. 123، 0. 105، 0. 114، 0. 009، 0. 053. 0. 316، 0. 027، 0. 017، 0. 017، 0. 009، 0. 105، 0. 017، and 0. 053، respectively for the two breeds. The calpastatin gene significantly affected live weight before slaughter، fat-tail weight (p<0. 001)، percentage of the fat-tail to carcass weights (p<0. 01) as well as fat bearing carcass weight (p<0. 05). Genotype AB was found as the superior genotype for all the traits. The favorable genotype for growth traits was AJ، whereas BE being the favorable one for weight and for percentage of fat-tail (animals with BE genotype bore a smaller fat-tail) but this genotype along with genotype BB were unfavorable as regards growth traits.