2024-03-29T16:53:27Z
https://lst.uk.ac.ir/?_action=export&rf=summon&issue=243
Journal of Livestock Science and Technologies
J. Livest. Sci. Technol.
2322-3553
2322-3553
2016
4
2
Effects of rosemary essential oils and zinc on performance, egg quality traits, and some serum biochemical metabolites of laying hens
F.
Hajiazizi
M.
Torki
M.
Habibian
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 < 0.05) in laying hens fed dietary supplementation of REO. Birds fed dietary REO supplementation had lower (P < 0.05) serum total cholesterol level compared with the control. However, this effect was not observed by combination of zinc and REO. These results indicate that the diet inclusion of REO had a potential to improve the egg quality traits and serum cholesterol level in laying hens.
Rosemary
zinc
egg quality
blood metabolites
laying hen
2016
09
01
1
6
https://lst.uk.ac.ir/article_1508_bfdce5345b6146f2e734518faa4143ad.pdf
Journal of Livestock Science and Technologies
J. Livest. Sci. Technol.
2322-3553
2322-3553
2016
4
2
Effects of zinc oxide nanoparticles on antioxidant status, serum enzymes activities, biochemical parameters and performance in broiler chickens
M.
Fathi
M.
Haydari
T.
Tanha
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.
Zinc Oxide Nanoparticles
Growth Performance
Antioxidant Status
Biochemical Parameters
Broilers
2016
09
13
7
13
https://lst.uk.ac.ir/article_1509_e3d96f9a488ed19775757dfd090332e7.pdf
Journal of Livestock Science and Technologies
J. Livest. Sci. Technol.
2322-3553
2322-3553
2016
4
2
Risk factors affecting the culling of Iranian Holstein dairy cows
J.
Bahrampour
M.
Danesh Mesgaran
A. R.
Arabpour
A.
Vakili
A.
Khezri
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< 0.001) increased with parity and twinning. The odds ratio of cows leaving the herd were 1.32, 1.55, 1.62, 1.67 and 1.88 for parities 2 to 6, respectively and 1.09 for twinnings. Also, the OR increased with increasing in calving difficulty score except for farmer assistant cow. The OR were 1.12, 1.36 and 1.23 for herds with 26 to 53, 54 to 125 and ≥126 calving cows and risk of culling was increased with increase in number of calving cows in the herd. Calving in hot season increased the risk of culling and cows calved in cool seasons had lower risk of culling. The OR were 0.87, 0.79 and .077 for summer, fall and winter respectively. The analysis showed that region had a significant effect (P< 0.001) on culling risk and cows in warm and dry and warm and semi-arid regions had a higher risk of culling compared the cows in temperate or cold and wet region. Risk of culling significantly (P< 0.001) decreased with increasing in standardized 305-d milk yield so that cows with higher milk yield had the lower risk of culling. Cows at the age first calving about 24 months had the lower risk of culling and with increasing the age at first calving, the risk of culling increased. In general, the obtained results showed that the evaluated risk factors can significantly affected the risk of culling in dairy farms and farmers can control and manage dairy cattle according to these factors.
Risk factors
Holstein cows
culling
Iran
2016
09
01
15
23
https://lst.uk.ac.ir/article_1510_3ef1d1acd46881a7814ea630c67f1b14.pdf
Journal of Livestock Science and Technologies
J. Livest. Sci. Technol.
2322-3553
2322-3553
2016
4
2
Intramuscular progesterone injection decreases sperm functionality and fertility in broiler breeder roosters
S.
Namdari Aliabadi
M. J.
Zamiri
M. R.
Jafarzadeh Shirazi
A.
Akhlaghi
Chicken seminal plasma contains a high content of sex steroids including progesterone (P4). According to a published study, in vitro supplementation of P4 to the semen resulted in decreased 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 including 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 determined. 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 measurements repeated. Progesterone injection decreased the sperm motility by 10%, membrane functionality (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
2016
09
13
25
30
https://lst.uk.ac.ir/article_1511_8756b8b6e60ea545eee5302623ad323b.pdf
Journal of Livestock Science and Technologies
J. Livest. Sci. Technol.
2322-3553
2322-3553
2016
4
2
Morphological differentiation between two Moroccan goat breeds
I.
Boujenane
L.
Derqaoui
G.
Nouamane
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<0.001) differences in the morphological traits of Barcha and Atlas breeds. Variance components analysis showed that between-breed variability explained 11.26% of total variance. The factor analysis extracted two factors with a total variance of 66.9%. The first factor had high loadings for BW (0.93), BL (0.88), HG (0.87) and WH (0.90), whilst the second factor had high association with EW (0.80) and EL (0.79). Results of the stepwise discriminant analysis showed that out of 10 variables considered, six were found to be the most discriminant characters. The Mahalanobis distance of the morphological traits between Barcha and Atlas was 3.832 (P<0.001). The developed discriminant function clearly discriminated and classified the Barcha and the Atlas goats into their breeds of origin, thus yielding after a cross-validation 87.2% and 78.1% correctly assigned to their source genetic group. It was concluded that there was a clear separation between Barcha and Atlas goats.
goats
Barcha breed
Atlas breed
morphological trait
discriminant analysis
2016
09
14
31
38
https://lst.uk.ac.ir/article_1515_66453763780be429f5452c1818525496.pdf
Journal of Livestock Science and Technologies
J. Livest. Sci. Technol.
2322-3553
2322-3553
2016
4
2
Bayesian inference of genetic parameters for reproductive traits in Sistani native cows using Gibbs sampling
H.
Faraji-Arough
M.
Rokouei
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.
calving interval
genetic correlation
fertility
conception rate
2016
09
13
39
49
https://lst.uk.ac.ir/article_1512_adc81dcf056c1695885ccf2854653895.pdf
Journal of Livestock Science and Technologies
J. Livest. Sci. Technol.
2322-3553
2322-3553
2016
4
2
Association of the melanocortin-3(MC3R) receptor gene with growth and reproductive traits in Mazandaran indigenous chicken
S. M.
Moazeni
M. R.
Mohammadabadi
M.
Sadeghi
H.
Moradi Shahrbabak
A. K.
Esmailizadeh
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 chicken. To determine the association between MC3R polymorphism and phenotypic variation, a total of 190 individuals from breeding station of Mazandaran indigenous chicken were genotyped using a modified PCR-RFLP method. The association of growth and reproductive traits was studied using a generalized linear model. The association analysis suggested a positive effect of genotype AA with average egg weight at age of 28 (EW28), 30 (EW30) and 32 (EW32) weeks compared with GG genotype (P< 0.05), and also positive effect of genotype AG with average egg weight at age of 30 (EW30) weeks compared with GG genotype (P
production traits
chicken
MC3R
PCR-RFLP
2016
09
01
51
56
https://lst.uk.ac.ir/article_1513_53dd6dd3eef683b0aa5898c20291755b.pdf
Journal of Livestock Science and Technologies
J. Livest. Sci. Technol.
2322-3553
2322-3553
2016
4
2
Estimation of genetic and phenotypic trends for body weight traits of sheep in Guilan province of Iran
B.
Eteqadi
N.
Ghavi Hossein-Zadeh
A. A.
Shadparvar
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<0.0001) for BW, 3MW and 6MW and being 0.51±0.101, 5.56±1.21 and 18.46±2.24 g/year, respectively. Maternal genetic trends for BW, 3MW and 6MW were negative and significant (P<0.0001); these were -0.14±0.04, -1.42±0.31 and -5.48±0.67 g/year, respectively. Phenotypic trends for above mentioned traits were -40.21±1.02 (P<0.0001), -206.54±7.01 (P<0.0001) and 23.38±9.08 (P<0.05) g/year, respectively, with their environmental trends estimated to be -40.72±0.919, -212.1±5.8 and 4.92±6.84 g/year, respectively. The results showed increases in the average breeding values for body weight in Guilan province sheep during the years under study; therefore, improvement in body weight of Guilan province sheep seems feasible in selection programs.
genetic trend
phenotypic trend
body weight
Guilan province sheep
2016
10
04
57
62
https://lst.uk.ac.ir/article_1516_16e4e4d2a59d8be6f9dd88f8cb3fc476.pdf