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Livestock Science and Technology - Volume:4 Issue: 2, Sep 2016

Journal of Livestock Science and Technology
Volume:4 Issue: 2, Sep 2016

  • تاریخ انتشار: 1395/12/26
  • تعداد عناوین: 8
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  • F. Hajiazizi, M. Torki, M. Habibian Pages 1-6
    This study was conducted to evaluate the effects of dietary supplement-ation of rosemary essential oils (REO) and zinc (as zinc sulfate) on performance, egg quality traits, and some serum biochemical metabolites of laying hens. A total of 144 44-weeks-old Lohmann LSL-Lite laying hens were randomly allocated into four treatments, each comprising six replicates of six birds. The first group was served as control and fed a corn-soybean meal based diet without REO or zinc supplement. The other three groups received control diet supplemented with 200 mg/kg REO, 40 mg/kg zinc, or both feed additives together. Supplementation of REO and zinc to the diet had no significant (P > 0.05) effects on egg production, egg weight, egg mass, feed intake, feed conversion ratio, body weight and production of abnormal eggs. Compared with the control, egg shape index was increased (P
    Keywords: Rosemary, zinc, egg quality, blood metabolites, laying hen
  • M. Fathi, M. Haydari, T. Tanha Pages 7-13
    This research was conducted to investigate the effect of zinc oxide Nanoparticles (nano-ZnO) in diets on the performance, antioxidant status, enzymes activity and some hematological parameters of broiler chickens. A total of 600 one–day-old male Ross 308 broilers were allocated to four treatment groups with five replications of 30 each from day 1 to 42 day of age. The birds were continuously diets supplemented with 0 (control), 10, 20 and 40 mg/kg of nano-ZnO as four experimental treatments. Average daily gain (ADG), Average daily feed intake (ADFI) and feed conversion ratio (FCR) were measured from 1 to 42 d of age. Triglyceride, high density lipoprotein (HDL), activity of alkaline phosphatase (ALP), Aspartate transferase (AST), alanine transferase (ALT), creatine kinase (CK), Total antioxidant capacity (T-AOC), superoxide dismutase (SOD), Malondialdehyde (MDA), and Glutathione peroxidase (GPx), were measured at 42 d of age. Broilers receiving 10 mg/kg nano-ZnO had significantly (P0.05) affected by treatments. In conclusion, the results of this study showed the inclusion of 20 mg/kg nano-ZnO improved the growth performance and antioxidant status in broilers.
    Keywords: Zinc Oxide Nanoparticles, Growth Performance, Antioxidant Status, Biochemical Parameters, Broilers
  • J. Bahrampour, M. Danesh Mesgaran, A. R. Arabpour, A. Vakili, A. Khezri Pages 15-23
    This experiment was conducted to evaluate the association between risk factors and the risk of culling in Iranian Holstein cows. The data consisted of 329,772 lactation records obtained from the Animal Breeding Center of Iran (2003 - 2012) and logistic regression was applied to investigate the associations between the predictor and response variables. The response variable in this experiment was the risk of culling and predictor variables were included calving season, parity, birth type, calving ease, standardized 305-d milk yield, age at the first calving, region and the number of calving cows in the herd. Risk factors analysis showed that the risk of culling significantly (P
    Keywords: Risk factors, Holstein cows, culling, Iran
  • S. Namdari Aliabadi, M. J. Zamiri, M. R. Jafarzadeh Shirazi, A. Akhlaghi Pages 25-30
    Chicken seminal plasma contains a high content of sex steroids including progesterone ( 4). According to a published study, in vitro supplementation of P4 to the semen resulted in de-creased fertility in the White Leghorn chicken; however, it is not known if increased P4 production in vivo is associated with decreased sperm fertility. Therefore, the aim of the present experiment was to study the effect of P4 injection on semen characteristics and fertility in broiler breeder chickens. Eighteen roosters and 55 laying hens of the Cobb 500 strain at 47 weeks of age were used in this experiment. Initially, semen was collected twice a week for 3 weeks and semen characteristics in-cluding the semen volume, sperm concentration, sperm motility, percentages of live and abnormal sperm, and sperm membrane integrity (using the hypo-osmotic swelling test; HOST) were deter mined. Then semen from each rooster inseminated to 3 hens and we evaluated sperm penetration, egg fertility and fertility duration. Subsequently, the roosters were injected with P4 (150 mg of the long-acting medroxy- progesteroneacetate) in the pectoral muscle and the above-mentioned meas-urements repeated. Progesterone injection decreased the sperm motility by 10%, membrane func-tionality (integrity) by 40%, egg fertility rate by 24% and number of days to first non-fertile egg by 3 days. However, sperm penetration of the perivitelline membrane increased about 60% (P
    Keywords: fertility, progesterone, rooster, sperm
  • I. Boujenane, L. Derqaoui, G. Nouamane Pages 31-38
    The objective of this study was to identify morphological measurements that best distinguish Moroccan Barcha and Atlas goat breeds. Ten measurements (body weight - BW, body length - BL, heart girth - HG, withers height - WH, rump height - WH, back length - BAL, neck length - NL, head length - HL, ear length - EL, and ear width - EW) of 876 adult animals of both sexes (547 Barcha and 329 Atlas) were studied. Average BW, HG and WH of Barcha goats were 37.4±11.1 kg, 75.0±5.26 cm and 71.8±3.41 cm, respectively. The corresponding values for Atlas goats were 38.8±8.92 kg, 76.2±5.56 cm and 72.3±4.11 cm, respectively. Most correlations were positive and significant, BW with BL (0.87) and BW with HG (0.91) being the highest for Barcha and Atlas breeds, respectively. The multivariate analysis of variance revealed significant (P
    Keywords: goats, Barcha breed, Atlas breed, morphological trait, discriminant analysis
  • H. Faraji Arough, M. Rokouei Pages 39-49
    This study was undertaken to estimate the genetic parameters for some reproduction traits in Sistani beef cattle. The data set consisted of 1489 records of number of insemination, calving, and insemination dates in different calving was used. Reproduction traits including calving interval (CI), gestation length (GL), days open (DO), calving to first service (CTFS), first service to conception (FSTC), conception rate (CR), pregnancy rate (PR), and number of insemination per conception (NSPC) have been evaluated. The variance components for traits were estimated using of different single-trait animal models analyzed via Gibbs and correlations between traits were estimated using the best multi-trait animal models. After convergence, the posterior mean of heritability for CI, GL, DO, CTFS, FSTS, CR, PR and NSPC in the best model were estimated as 0.032, 0.113, 0.096, 0.002, 0.012, 0.082, 0.023, and 0.123, respectively. The highest and lowest genetic correlations were found for CI×CR (-0.999) and CTFS×NSPC (0.001), respectively. The results showed that the additive genetic for the most of reproduction traits in Sistani beef cattle was low so doing selection for these traits would make slow progression. However, the estimated heritability of GL, DO, and NSPC and also genetic correlation of these traits with CI, CR and PR may suggest that selection for these traits in Sistani beef cattle could be an effective way to make genetic improvement.
    Keywords: calving interval, genetic correlation, fertility, conception rate
  • S. M. Moazeni, M. R. Mohammadabadi, M. Sadeghi, H. Moradi Shahrbabak, A. K. Esmailizadeh Pages 51-56
    Melanocortin-3 receptor (MC3R) plays an important role in the central control of energy homeostasis, and several functional polymorphisms of this gene have been detected. We have studied MC3R as a candidate gene responsible for variation in economically important traits in the chicken. To determine the association between MC3R polymorphism and phenotypic variation, a total of 190 individuals from breeding station of Mazandaran indigenous chicken was genotyped using a modi-fied PCR-RFLP method. The association of growth and reproductive traits was studied using a gen-eralized linear model. The association analysis suggested a positive effect of genotype AA with av-erage egg weight at ages 28 (EW28), 30 (EW30) and 32 (EW32) weeks compared with the GG genotype (P
    Keywords: production traits, chicken, MC3R, PCR, RFLP
  • B. Eteqadi, N. Ghavi Hossein Zadeh, A. A. Shadparvar Pages 57-62
    The main objective of the present study was to estimate genetic and phenotypic trends for body weight traits in Guilan province sheep. Traits included were birth weight (BW, n=14,549), 3-month weight (3MW, n=13,109) and 6-month weight (6MW, n=10,141). Data and pedigree information used in this study were collected during 1994 to 2011 by the Agricultural Organization of Guilan province in Iran. Animal breeding values were predicted using univariate analysis based on animal model. The GLM procedure of SAS was used for determining the fixed effects which had significant influence on the traits under study. The Wombat software was employed to estimate the breeding values. The Best Liner Unbiased Predictions (BLUP) of breeding values were obtained, and genetic and phenotypic trends were estimated as the regression of the average predicted breeding and phenotypic values on birth year, respectively. Environmental trends were calculated as the difference between phenotypic and genetic trends. Direct genetic trends were positive and significant (P
    Keywords: genetic trend, phenotypic trend, body weight, Guilan province sheep