The interactive effects of the antifouling herbicides Irgarol 1051 and Diuron on the seagrass Zostera marina (L.).

The herbicides Irgarol 1051 (2-(tert-butylamino)-4-cyclopropylamino)-6-(methylthio)-1,3,5-triazine) and Diuron (3-(3',4'-dichlorophenyl)-1,1-dimethylurea) are commonly incorporated into antifouling paints to boost the efficacy of the compound towards algae. Previous investigations have identified environmental concentrations of these herbicides as being a threat to non-target organisms, such as seagrasses. Their individual toxicity has been assessed, but they can co-occur and interact, potentially increasing their toxicity and the threat posed to seagrass meadows.

Effects of testicular status and feeding diets containing date palm by-product on the sensory attributes of Omani lamb meat.

The effects of testicular status and diet on the tenderness and flavour intensity of Omani lamb meat were evaluated. Thirty male lambs were divided into three testicular status treatments shortly after birth, entire, castrated or induced to cryptorchidism. The animals were fed a maize and soya bean meal based diet, isocalorically supplemented with either palm fronds or Rhodesgrass hay.

The effect of undernutrition of beef cows on blood hormone and metabolite concentrations post partum.

Twelve Hereford Friesian cows were allocated to either a high plane (HP) or a low plane of nutrition (LP) post-partum. HP animals received rations supplying sufficient energy and protein for maintenance plus 10 kg/day milk yield. LP cows were offered approximately 70% of their maintenance needs for 63 days post-partum.

Effect of diet and season on steroid hormones in the ruminant.

The effects of diet and season on blood concentrations of progesterone and glucocorticoids in sheep and cattle are reviewed. Underfeeding tends to increase progesterone in sheep but the effects in cattle are equivocal. Sheep undergo seasonal anoestrus but there is very little evidence for circannual variations in progesterone in cattle.