Effect of shearing on some physiological and hormonal parameters in Akkaraman sheep

Abstract

Objective: Shearing is one of the practices that is applied periodically to fiber producing animals, which can also alter resistance of animals to high temperatures in especially summer months. This study aimed to investigate effects of shearing on some physiological and hormonal parameters in Akkaraman sheep during summer season.Methods: This study was carried out on 39 non-pregnant Akkaraman ewes (aged 1.5 years at the beginning of experiment). The 39 ewes were chosen randomly from the flock belonging to the Erciyes University and they were assigned to two groups as follows: i) group A (n = 20) designed as the control group, they were shorn and group B (n = 19) designed as the experimental group, they were unshorn. Prior to the shearing (–1 day) and on days 1, 7, 15, 30, 45, 60, 75, and 90 following the shearing, blood samples were taken from the vena jugularis of each sheep. Cortisol, β-endorphin, growth hormone (GH), thyroxine (T4), triiodothyronine (T3), and heat shock protein 70 (HSP-70) concentrations were determined using the enzyme immunoassay method. Body weight (BW), rectal temperature (RT), pulse rate (PR), and respiratory rate (RR) of each sheep were recorded at the same time. The data obtained were analyzed using two-way repeated measures analysis of variance.Results: Statistical analysis showed a significant effect of shearing×period interaction (p<0.01) and a significant effect of period (p<0.01) on BW, HSP-70, cortisol, T4 and RT, PR, GH, β-endorphin, T3, respectively. Also these analysis showed no significant effect of shearing× period interaction or period on RR.Conclusion: The results showed that the thermoregulation abilities of sheep were affected by shearing treatment and the shorn ewes were less affected by heat stress. In conclusion, based on the data of this study, shearing can be considered as a necessary management practice that requires protection for sheep from the effect of heat stress.

Relationship of some metabolic Hormones with Increased Live Body Weight of Male and Female of Karakul and Awassi Lambs

“…This is also consistent with the studies that reported a positive correlation between birth weights with subsequent weaning and six-month weights in Madras red sheep, Carole × Malpura sheep, Harnali sheep, and Egyptian Barki sheep (Gowane et al, 2011;Ganesan et al, 2013;Lalit et al, 2016;Abd El Tawab et al, 2020). Furthermore, it was shown that Akkaraman sheep recorded a tight correlation with T4 level, growth, and wool shearing capacity (Pehlivan et al, 2020). In contrast with T4 results, our study refuted any correlation between the concentration of GH and the age of investigated sheep at birth, weaning, and six months' age.…”

Relationship Between Sheep Farmer’s Characteristics with the Animal and Environmental Health Management Practices in Batur Village, Banjarnegara, Indonesia

“…Shearing is one of the practices that is applied periodically to fiber-producing animals. Shearing in sheep can affect the ability of thermoregulation to support adaptation and make the animal feel comfortable in the environment [33]. The shaving period was mostly done every 6 to 12 months (39.6%).…”

Effect of Early Shearing on The Nutritional Metabolism, Growth Performance and Carcass Traits of Barki Lambs تأثير الجز المبکر على التمثيل الغذائي وکفاءة النمو وصفات الذبيحة في الحملان البرقي

“…Generally, growth depends on the composition and quantity of available nutrients under regulation by endocrinological controls and biochemical mechanisms. Pehlivan et al (2020) found that metabolic hormones such as T4 and T3 concentrations in blood decreased because of increasing temperature, however, this decrease was higher in the unshorn control group, this attributed increase the metabolic rate in shorn animals (Squires, 2003 andPehlivan et al, 2020). The rate of production in different tissue depends mainly on the competition or cooperation of nutrient between tisses and controlled by physiological, environmental and endocrine factors (Black and Reis, 1979).…”