Tetracycline may be used to treat several types of bacterial diseases in ruminants. In addition, tetracycline is added to food to promote the growth. There are few reports on the pharmacokinetics of tetracycline in sheep. Therefore, the objective of this study was to examine the pharmacokinetic characteristics of the drug in sheep. Ten apparently healthy mixed-breed sheep were administered 20 m...

Sixty-four white-faced rams and wethers were dressed with the aid of a commercial pelt puller. The effects of age, castration, and season on difficulty of pelt removal and pelt damage were evaluated. Lambs were divided into two age groups (5 and 12 mo) within gender (ram and whether) and season (spring and fall). A greater force (P less than .05) was required to remove pelts from rams than from...

The role of the lymphatic system in the absorption of fat in sheep and lambs was investigated by Heath & Morris (1962) and their experiments showed that a considerable proportion of the dietary fat is absorbed into the intestinal lymph and carried to the blood by way of the thoracic duct. In young lambs, the pattern of fat absorption resembles that in cats, rats and rabbits. When a fat meal is ...

Forty cross-bred western wether lambs were divided into two equal groups. During a growth period, 20 lambs received a maintenance diet, and 20 lambs were fed an adequate diet. Four Iambs from each group were slaughtered after the growth period, and extramuscular adipose tissue lipoprotein lipase activity (LPL) and intramuscular lipid content were determined. Lambs from each growth phase group w...

This study was looking for the effects of energy levels and growth performance on physical characteristics Iranian lambs’ meat. Forty-eight male lambs (initial BW 31.6kg) 5-month age were assigned to a completely randomized design with factorial method includes fattening periods (12weeks 15weeks) metabolism (ME) (2.36 2.62 ME M cal/kg DM intake). Diets iso-nitrogenous (14.1 percent crud protein...

This study aimed to investigate the effect of the ratio of non-fibrous carbohydrates to neutral detergent fibre (NFC/NDF) and undegraded dietary protein (UDP) on rumen fermentation and nitrogen metabolism in lambs. Four Dorper×thin-tailed Han crossbred lambs, averaging 62.3±1.9 kg of body weight and 10 mo of age, were randomly assigned to four dietary treatments of combinations of two levels of...

Marsupials are born with immature lungs when compared to eutherian mammals and rely, to various extents, on cutaneous gas exchange in order to meet metabolic requirements. Indeed, the fat-tailed dunnart is born with lungs in the canalicular stage of development and relies almost entirely on the skin for gas exchange at birth; consequently undergoing the majority of lung development in air. Plan...

Chinese indigenous sheep can be classified into three types based on tail morphology: fat-tailed, fat-rumped, and thin-tailed sheep, of which the typical breeds are large-tailed Han sheep, Altay sheep, and Tibetan sheep, respectively. To unravel the genetic mechanisms underlying the phenotypic differences among Chinese indigenous sheep with tails of three different types, we used ovine high-den...

Uniquely for non-primate mammals, three classes of cone photoreceptors have been previously identified by microspectrophotometry in two marsupial species: the polyprotodont fat-tailed dunnart (Sminthopsis crassicaudata) and the diprotodont honey possum (Tarsipes rostratus). This report focuses on the genetic basis for these three pigments. Two cone pigments were amplified from retinal cDNA of b...