Maryam Moghadam Mousaabadi; Homayoun Farhangfar; Moslem Bashtani; AliReza Eghbal
Volume 15, Issue 2 , October 2013, Pages 79-88
Abstract
The objective of the present research was to apply logistic analysis for investigating some factorsaffecting incidence probability of milk fat depression (MFD) in early lactation of Iranian Holstein cows.The data set was comprised 80381 test day records (milk, fat and protein traits) belonging to 80254 ...
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The objective of the present research was to apply logistic analysis for investigating some factorsaffecting incidence probability of milk fat depression (MFD) in early lactation of Iranian Holstein cows.The data set was comprised 80381 test day records (milk, fat and protein traits) belonging to 80254 firstparity cows in 427 herds with calving year between 1995 and 2009. Based on fat to protein percentagesfor the first month of the lactation and also with respect to threshold point of -0.12, dependent variablewas defined as a dichotomous (zero code for lack of MFD and unit code for MFD) variable. A logisticmixed generalized linear model was fitted on the data using GLIMMIX procedure of SAS software. Inthe model, fixed effects of sperm type (local or exotic), production season, first calving age, cow type(grade or pure Holstein) and random effect of animal’s sire were included. Cow type had no significantaffect on MFD. Estimation of odds ratio for comparing different ages was found to be 1.112 indicatingthat cows calving at lower age of 25 months are expected to show MFD by 11.2 percent smore than thecows calving at the greater ages. The estimate of odds ratio for comparing of spring with summer, autumnand winter seasons were 0.73, 0.722 and 1.182, respectively. The corresponding figures for summer ascompared to autumn and winter seasons were 0.987 and 1.615, respectively, and autumn as compared towinter was found to be 1.636. Daughters of the local bulls are expected to show MFD by 10.8 percentmore than that of the daughters of the foreign bulls.
Hasan Moradian; Ali Esmailizadeh; Mohammadreza Mohammadabadi
Volume 15, Issue 2 , October 2013, Pages 89-99
Abstract
The purpose of this study was to identify genomic regions of quantitative trait loci (QTL), affectingcarcass traits on chromosome 1 in an F2 population of Japanese quail. For this purpose, a three-generationresource population was developed by using two distinct Japanese quail strains, wild (meat type) ...
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The purpose of this study was to identify genomic regions of quantitative trait loci (QTL), affectingcarcass traits on chromosome 1 in an F2 population of Japanese quail. For this purpose, a three-generationresource population was developed by using two distinct Japanese quail strains, wild (meat type) andwhite (layer type). Eight pairs of white and wild birds were crossed reciprocally and 34 F1 birds wereproduced. The F1 birds were intercrossed to generate 422 F2 offspring. Phenotypic data including weightof carcass parts were collected on F2 birds. All of the animals from three generations (472 birds) weregenotyped for eight microsatellite markers on chromosome 1. QTL analysis was performed with leastsquares interval mapping method fitting three various statistical models. Significant QTL were identifiedfor breast weight, carcass weight, head weight and percentage of breast. There was also evidence forimprinted QTL affecting breast weight, a carcass part of high economic value, on chromosome 1. Theproportion of the F2 phenotypic variation explained by the significant additive, dominance and imprintedQTL effects ranged from 1.8 to 2.3, 1.2 to 3.3 and 0.5 to 2.2 percent, respectively.
Elham Javdan; Jamal Fayazi; Saleh Tabatabaei; Mohammadtaghi Baigi Nasiri
Volume 15, Issue 2 , October 2013, Pages 101-107
Abstract
This study was conducted to detect polymorphism of gene BMP15, a member of Transforming GrowthFactor β (TGFβ) family which has a crucial role in controlling the ovarian follicles development,ovulation rate and fertility. Samples were randomly selected from 91 Najdi goats in 3 geographicallocations, ...
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This study was conducted to detect polymorphism of gene BMP15, a member of Transforming GrowthFactor β (TGFβ) family which has a crucial role in controlling the ovarian follicles development,ovulation rate and fertility. Samples were randomly selected from 91 Najdi goats in 3 geographicallocations, northwest, southeast and center of Khuzestan province. After DNA extraction, amplification of235 bp fragment of exon 2 of BMP15 gene was performed using specific primers. Sequence detectionwas executed after amplification of gene fragments. The association of BMP15 gene and litter size wasdone by SAS software. Results from sequencing were analyzed by Vector NTI software. The resultsidentified three mutations in bases 529 (T to G), 530 (C to G) and 576 (T to C). The largest litter sizebelongs to AA pattern. Point mutations in this gene will alter the Ovulation rate of the goat. Therefore,improving twining trait in Najdi population can be expected by marker assisted selection.
Mokhtar Malaki; Mohammadali Norouzian; Aliakbar Khadem
Volume 15, Issue 2 , October 2013, Pages 109-115
Abstract
This research was conducted to evaluate the effect of different zinc (Zn) sources on performance, bloodmineral and cell counts of Zandi lambs. 18 male lambs at weaning were supplemented with two differentsources of zinc, 25 ppm ZnSO4 and 25 ppm zinc-peptide added to the basal diet as control. Live bodyweight, ...
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This research was conducted to evaluate the effect of different zinc (Zn) sources on performance, bloodmineral and cell counts of Zandi lambs. 18 male lambs at weaning were supplemented with two differentsources of zinc, 25 ppm ZnSO4 and 25 ppm zinc-peptide added to the basal diet as control. Live bodyweight, weight gain and feed efficiency improved with Zn-peptide supplementation (P<0.05). Sera Znconcentration was higher and copper and iron concentration was lower in zinc supplemented groups(P<0.05). Supplementation of zinc had no effect on blood cell counts except for white blood cells thatdecreased with zinc peptide supplementation (P<0.05). It was concluded that adding 25 ppm zinc peptideto fattening lamb diet improved performance and cause to higher level of blood zinc.
Fereshteh Jamili; Farid Shariatmadari; Mohammad-amir Karimi Torshizi
Volume 15, Issue 2 , October 2013, Pages 117-126
Abstract
This experiment was conducted to evaluate the effect of emulsifiers such as lecithin and bile salts onbroilers performances fed diet containing vegetable fats. 192 male Ross broiler chickens were randomlyallocated in a factorial experiment design of 3 × 2, consisting two sources of fat (four percent ...
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This experiment was conducted to evaluate the effect of emulsifiers such as lecithin and bile salts onbroilers performances fed diet containing vegetable fats. 192 male Ross broiler chickens were randomlyallocated in a factorial experiment design of 3 × 2, consisting two sources of fat (four percent fatty acidsor soy bean oil) and three emulsifiers (none, one percent lecithin and 0.05 percent bile salts) incompletely randomized design with four replicates and eight birds per each. Total weight gain and feedconversion ratio was not affected by fat sources while soya oil addition to diets increased feed intake(P<0.05). Emulsifiers’ addition to diet improved weight gain feed conversion ratio (P<0.05). The lengthand width of villi in jejunum, and crypt depths in duodenum were not affected by fat sources, while, cryptdepth in jejunum and width of villi in ileum of birds fed on diets containing fatty acid were higher thanother birds (P<0.05). Addition of emulsifiers to diets increased dietary metabolisable energy (P<0.05). Inconclusion, addition lecithin or bile salts to diets containing soybean oil or its fatty acids, improved bodyweight gain and feed conversion ratio in broiler chicks by increasing in absorption area of intestine anddietary metabolisable energy.
Rohollah Ebrahimi; Tahereh Mohammadabadi; Mohsen Sari; Somayeh Sallari; Mohammadjavad Zamiri; Mohammadtaghi Beigi Nassiri
Volume 15, Issue 2 , October 2013, Pages 127-138
Abstract
In order to investigate the effect of different levels of silymarin (0, 100 and 200 mg/kg diet) onperformance, carcass characteristics, blood parameters and antioxidant status, 120 day-old chicks wereassigned to 3 treatments with four replicates and 10 birds in each in a completely randomized design.Results ...
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In order to investigate the effect of different levels of silymarin (0, 100 and 200 mg/kg diet) onperformance, carcass characteristics, blood parameters and antioxidant status, 120 day-old chicks wereassigned to 3 treatments with four replicates and 10 birds in each in a completely randomized design.Results showed supplementation of 200 mg silymarin significantly decreased the body weight gain(BWG) in starter (P<0.05) and whole period of experiment (P<0.01) and significantly increased feedconversion ratio at starter (P<0.05), grower (P<0.05) and total rearing periods (P<0.01). Also, addition of100 mg silymarin significantly increased the carcass relative weight (P<0.01) and supplementation of 200mg silymarin significantly increased the breast relative weight (P<0.05). Furthermore, 200 mg silymarinsignificantly increased the malondialdehyde and heterophil/ lymphocyte ratio and significantly decreasedsuperoxide dismutase (P<0.05). These results showed that supplementation of silymarin in diet undernormal condition, improved the carcass and breast relative weight, but no had effect on bird’s oxidativestatus.
Sohrab Azarfar; Ali Nobakht; Yousef Mehmannavaz
Volume 15, Issue 2 , October 2013, Pages 139-148
Abstract
This experiment was conducted to investigate the effects of using different levels of thyme (Thymusvulgaris L.) medicinal plant and multi enzyme (Kemine) on performance and blood biochemicalparameters of Japanese quails with 240 laying bird (6 up to 12 weeks) as a 2*2 factorial include twolevels of thyme ...
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This experiment was conducted to investigate the effects of using different levels of thyme (Thymusvulgaris L.) medicinal plant and multi enzyme (Kemine) on performance and blood biochemicalparameters of Japanese quails with 240 laying bird (6 up to 12 weeks) as a 2*2 factorial include twolevels of thyme (0 and 0.75 percent) and 2 levels of Kemine enzyme (0 and 0.05 percent) in fourtreatments, 4 replicates and 15 laying quails in each replicate in a completely randomized design.Interaction between thyme and enzyme did not have any significant effects on egg productionperformance. Whereas egg weight in birds who consume thyme, was high (P<0.05) and amounts of blooduric acid and eggshell thickness in birds who received enzyme and thyme in diets, increased (P<0.05).The overall results indicated that using enzyme and thyme in Japanese quails diets can be have positiveeffects on egg weight and eggshell thickness.
Volume 15, Issue 2 , October 2013, Pages 1-7