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https://www.selleckchem.com/products/bmn-673.html The current review is designed with aims to highlight the impact of heat stress (HS) on calves and heifers and to suggest methods for HS alleviation. HS occurs in animals when heat gain from environment and metabolism surpasses heat loss by radiation, convection, evaporation and conduction. Although calves and heifers are comparatively heat resistant due to less production of metabolic heat and more heat dissipation efficiency, they still suffer from HS to some degree. Dry matter intake and growth performance of calves and heifers are reduced during HS because of redistributing energy to heat regulation through a series of physiological and metabolic responses, such as elevated blood insulin and protein catabolism. Enhanced respiration rate and panting during HS accelerate the loss of CO2, resulting in altered blood acid-base chemistry and respiratory alkalosis. HS-induced alteration in rumen motility and microbiota affects the feed digestibility and rumen fermentation. Decreased luteinizing hormone, estradiot nutrient deficiencies because of HS.Background Aflatoxin B1 (AFB1), a highly toxic mycotoxin, is one of the contaminants of food items such as corn, rice, nuts, and flour. This study aimed to evaluate the effect of AFB1 on the histology and ultrastructure of the submandibular salivary glands (SMSG) of albino rats and examine the possible therapeutic effect of Rosmarinus officinalis extract. Methods This study used 21 adult male albino rats equally divided into three groups as follows Group C (saline-treated control group); Group A (AFB1 treated group) subjected to intraperitoneal injection of AFB1 (2 mg/kg) once daily for four weeks; Group R (rosemary-treated group) subjected to AFB1 as in Group A followed by two weeks of intraperitoneal injection of Rosmarinus officinalis extract (400mg/kg) once daily. At the end of the experimental periods, SMSGs were excised and fixed for histological and ultrastructural exa

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