جستجوی مقالات مرتبط با کلیدواژه « sex » در نشریات گروه « علوم دام »

The aim of this experiment was to compare the feedlot performance and carcass characteristics of Lori Bakhtiari and Romanov×Lori-Bakhtiari crossbreed lambs. Forty-four Lori-Bakhtiari lamb and Forty-four Romanov×Lori-Bakhtiari lambs were used in a completely randomized design and using a factorial method (2×2) during two consecutive years. The average daily gain and daily feed intake were determined by individual weaning of each animal and then feed conversion ratio was calculated. Carcass characteristics of lambs were measured. The results showed that average daily gain during fattening period (212.1vs. 179.6 g), final fattening weight (52.12 vs. 48.26 kg), feed intake, carcass weight and fat tail percentage in Lori Bakhtiari lambs were greater than Romanov× Lori Bakhtiari crossbred lambs. The average daily gain before weaning (298.4 vs. 266.8 g), the average daily gain during fattening period (217.2 vs. 161.9 g), and feed conversion ratio (7.62 vs. 9.75) in male lambs was better than female lambs (p < 0.05). Fat tail percentage and total carcass fat content in male lambs were higher than that of female lambs (p < 0.05). It is concluded that, Romanov×Lori Bakhtiari crossbred lambs had higher performance than Lori Bakhtiari lambs before weaning. However, fattening period performance and carcass weight in Bakhtiari lambs were higher compared to Romanov×Lori Bakhtiari crossbred lambs. In addition, energy spent per kg of carcass and live weights in Bakhtiari lambs was lower than Romanov×Lori Bakhtiari crossbreds. Therefore, it can be concluded that the indigenous Bakhtiari sheep breed is more useful for fattening than that of Romanov×Lori Bakhtiari crossbreds in Chaharmahal and Bakhtiari province.

The present study was conducted to evaluate the effect of Tribulus Tresstrise (TT) herb on sex ratio of semen in Arabic Khouzestan ram using real time-qPCR technique using 18 rams in a completely randomized design with 3 treatments. The SRY and PLP genes were amplified to isolate the specific fragments of Y- and X- chromosome sequences. The treatments included: i) the control group (0% TT), ii) Diet containing 15 g/kg TT, iii) Diet containing 30 g/kg TT. Sperm sampling was taken from all rams at 10 month of age and blood sampling was performed at 8 and 10 month of age. The results showed that expression rate of SRY gene increased with increasing TT level and rams that received 30 g/kg TT diet had the highest SRY gene expression and PLP gene expression decreased with increasing TT level (p-value =0.004). There was positive correlation between Testosterone concentration and SRY gene expression at 8 (0.65) and 10 (0.59) month of age, and the relationship between PLP gene expression and Testosterone concentration was negative and -0.61 and -0.66 at 8 and 10 month of age, respectively (p-value= 0.006). The results indicated that adding Tribulus Tresstrise herb to the ram diet increases the SRY gene expression and also sperm containing Y chromosome. In other words, it increases the sex ratio toward male gens in Arabic Khozestan ram by increasing the androgen hormones.

Introduction The expected values of hematologic and serum biochemical parameters in domestic animal species can be affected by breed, age, environment, and nutrition. Established breed-specific reference intervals (RI) are an important tool for monitoring the health of sheep. There is a lack of published data on biochemical RI for Sngsari sheep. Thus, the aims of this study were to establish RI for select of serum biochemical parameters for Sangsari sheep by Reference Value Advisor (RVA) method and provide information on the studied parameters for both sex of this breed in order to form a basis for clinical interpretation. 
Materials and Methods Sixty healthy Sangsari sheep including 26 ewes and 34 rams (2–4 years old) were chosen from the breeding station of Sangsari sheep among 150 sheep in Damghan, Semnan, Iran. The type of feeding, all the animals had free access to water and to good-quality alfalfa hay (90.0 % DM, 15.8 CP % DM, 50.4NDF%DM, 31.6ADF%DM, 5.8 lignin% DM, and 2.2 EE % DM). Concentrate (23 % oats, 36 % corn, 38 % barley, and 3%mineral and vitamin supplements) was provided once daily (200 g per animal per day). In the sampling day, breeder signed a subscription form and completed a primary questionnaire consisting of specific questions about past and current health status, sexual status, medications used, and familial and reproductive medical history. Complete physical examinations were performed by the same experienced veterinarian on each sheep. In order to reduce stress, blood samples were taken in the station with minimal changes in the usual schedule of the sheep. Blood samples (taken from the jugular vein) were collected in simple tubes in order to separate the serum (centrifuged at 3000 rpm for 10 min) for biochemical analysis. Samples transported at +4 °C to the laboratory department of the Faculty of Veterinary Medicine, Semnan, Iran. Biochemical parameters were measured by a autoanalyzer. These parameters included alkaline phosphatase (ALP), gamma glutamyletransferase (GGT), aspartate aminotransferase (AST), blood urea nitrogen (BUN), total protein (TP) and albumin (Alb). For statistical analysis, data were analyzed by Reference Value Advisor and outliers were deleted if detected according to Tukey or Dixon. RIs, according to sample size, were determined using a robust method and following Box-Cox transformation of data. The data were normally distributed, and differences between sexes in biochemical parameters were analyzed using independent sample T test. A value of P<0.05 was considered as significant.
Results and Discussion The RI of biochemical parameters obtained from adult healthy Sangsari sheep includes the following: ALP 49.24-564.84 u/l; GGT 24.14-62.23 u/l; AST 10.86-338.40 u/l; BUN 6.91-26.43 mg/dl; TP 5.19-13.95 gr/dl and Alb 0.92-3.63 gr/dl. Established RI of biochemical parameters for ewes and rams, respectively including: ALP 29.98-702.89 u/l; GGT 22.41-54.49 u/l; AST 1.36-279.89 u/l; BUN 5.95-26.86 mg/dl; TP 5.75-12.83 gr/dl; Alb 0.84-2.77 gr/dl and ALP 106.08-568.55 u/l; GGT 20.80-58.30 u/l; AST 360.12 u/l; BUN 8.15-26.04 mg/dl; TP 4.66-15.59 g/dl and Alb 0.74-3.77 g/dl. Interpretation of the biochemical results in different breeds of sheep, with regard to RI for each parameter, in conjunction with history, clinical findings and other paraclinical tests helps the clinician to reach a definitive diagnosis. A unique feature of Sangsari sheep is that they are highly adaptable with desert and mountain ranges with high tolerance of drought conditions. This breed is also relatively small size and light weight, and most studies have focused on genetic characteristics associated with this trait. In view of the characteristics mentioned above and considering the lack of reference range for biochemical parameters, it is necessary to determine reference intervals in Sangsari sheep. In order to establish a comprehensive reference interval in Sangsari sheep, a select biochemical parameters were evaluated in the present study. Almost most of the established RI for biochemical parameters in this study differed from previously published RI, so that the lower and upper limits of RI of theses parameters (with the exception of BUN) were lower and higher than the values previously reported. Differences between obtained RI for the Sangsari sheep and previously reported RI for other breeds may be attributed to variations in hormonal influences, hydration status, dietary differences, or adaptations to a desert environment, age, breed, season of study and analytic method. Conclusion The obtained data provided reference interval for biochemical parameters in Sangsari sheep for the first time. Present study demonstrates significant differences in most of the biochemical parameters. Reference intervals determined in this study provide a baseline for interpreting biochemical results in Sangsari sheep, and contribute to optimization of the management of this species.

Sex of birds creates a fundamental difference in the physiological and nutritional requirements. For example, the feed conversion ratio of female broiler chicks is higher than that of males (over 30 days of age), which results in more fat storage in the body of females (Verapeen and Driver 2000). Although there are several reports on the superiority of male chicks to females in various economic traits such as average daily gain (Verapin and Driver 2000; Ojedapo et al. 2008; Zamani et al. 2012); feed intake (Fischer 1985; Laseinde and Oluyemi 1994; Zamani et al. 2012) and carcass traits (Verapeen and Driver 2000; Ojedapo et al. 2008; Zuowei et al. 2011; Taghan Agh et al. 2011), on the contrary, it has been shown that the mixed rearing of males and females leads to stimulation of protein anabolism, nitrogen uptake and mineral retention and so a higher weight gain at the end of the breeding period (Iyeghe –Erakpotobor 2001). This study was conducted to compare the bio-economic indexes of broiler production with different sex ratios from 11 to 42 days of age.
Material and The experiment was done using 180 Ross 308 broilers in 5 sex ratio groups (Group 1: 25% male and 75% female, Group 2: 50% female and 50% male, Group 3: 75% male and 25% female, Group 4: 100% female and Group 5: 100% male) with 3 replicates and 12 birds per replicate by employing a completely randomized design. Grower (11-24 days) and finisher (25-42 days) periods’ ration of broilers were balanced based on Ross-308 catalog. Feed intake (FI), average daily gain (ADG) and feed conversion ratio (FCR) were measured for each experimental group at the grower (11-24 days), finisher (25-42 days) and total (11-42 days) periods based on the hen- day method. At the end of the experiment (forty-second day), European Production Efficiency Factor (EPEF) and European Broiler Index (EBI) and also carcass traits after 9 hours starving were calculated by selecting 4 chicks per pen considering the sex ratio of each group. For economic evaluation, an index was formulated to determine the worst and best rearing periods (2014-2015) and then costs of grower and finisher rations based on 3 ways of pricing (Rials/kg) contains mean price of 2015, mean price of worst period and mean price of best period were estimated. To estimate income and profit, 3 methods of sale methods were included sale of live chicken, sale of carcass and Half-split sale. So, means of income and profit (Rials/chick) in studied groups were estimated based on 9 economic evaluation methods (3 sale methods×3 pricing methods).
Feed intake was significant only in grower period (11-24 d) and groups with 25% and 75% males had the highest amount of feed intake (P According to the results of comparing profit using different economic evaluation methods, it can be recommended that mixed sex production of broiler chickens will be alright when the proportion of males not to be less than 50%.

The aim followed in the present study was an evaluation of the adaptive immune traits (cellular and humoral) of both males and females in Iranian commercial vs Azarbayijan native fowls. Information obtained from cellular and humoral responses of 49 birds of Arian broiler line. 79 Azarbayijan native birds were made used of. Total antibody titration، Immunoglobulin Y titration (IgY)، and Immunoglobulin M titration (IgM) were determined with in the birds، 22 and 50 weeks of age following a challenging of the birds with sheep red blood cells. Moreover، the cellular immune responses of the birds were determined following a challenging of the birds with phytohemaglutinin. For the 22 weeks of age birds، the total antibody and IgY titres were significantly higher in the native strain than in those of the Arian strain. As for Arian strain، sexual dimorphism was observed within 22 and 50 weeks of age birds for total antibody and IgY titres، while، for humoral immune responses no significant difference was observed for native strains. Unlike humoral immunity، in native strains، sexual dimorphism was found for cellular immunity. As for Arian strain there were no significant differences observed for cellular immune response between males and females.

The objective of the current study was to investigate the effects of sex and carcass weight on the fatty acid composition in Longissimus dorsi in Zel lambs. Thirty pasture reared lambs (15 males and 15 females) were randomly selected from local flocks. Following slaughtering، the carcasses were assorted into two groups، according to their weights (>15kg and <15kg). Back fat thickness as well as intramuscular fat weighed more in female lambs and as well in lambs of greater than 15 kg carcass weight (p<0. 05). Females and heavier lambs (>15kg carcass weight) bore higher a* (redness) than males and than lambs of less weight (p<0. 05 and p<0. 01، respectively). However، males showed higher b* (yellowness) than female lambs (p<0. 05). Cooking loss and shear force in females were recorded as less than those for male lambs (p<0. 05). SFA/PUFA ratio was observed to be greater in female lambs and in lambs of more than 15 kg carcass weights (p<0. 05). The ratio of n-3: n-6 PUFA in less weighted lambs (<15 kg carcass weight) was lower than that in heavier lambs. Meat from males was of a lower atherogenic Index (AI)، as compared with that from female lambs (p<0. 05). In total، meats from males and from lambs of lower than 15kg carcass weight were observed to be of more desirable nutritional characteristics and color quality.

20 one-month-old Sanjabi suckling lambs (ten males and ten females with initial liveweight of 13.4 ± 1.3 and 11.6 ± 0.9, respectively) were used to assess the effect of ad libitum creep mixture on dry mater intake, live weight gain and carcass characteristics. The lambs were blocked within sex according to their live weight and randomly allocated to one of two treatments, control (free suckling and free choice of alfalfa) or supplementary (ad libitum creep mixtures with free suckling and free choice of alfalfa) in a 2 × 2 factorial arrangement. The study was continued for 100 days and at the end of the experimental period, all lambs were slaughtered to assess carcass characteristics. Average daily milk intake of males was higher than females (P< 0.01). Daily live weight gain (g/d) was significantly (P< 0.01) higher in males than females (240 vs. 163 g/d) and in the supplementary group than the control (259 vs. 145 g/d). Fat tissue in both male and female lambs in supplementary group was significantly (P< 0.01) more than that in the control. It could be concluded that the creep mixture diet improved growth rate and carcass characteristics and the fat content of the lambs.