Sheep Nutrition and Welfare: Meeting Flock Requirements

Sheep Nutrition and Welfare

Nutritional welfare is fundamental to sheep management. Inadequate nutrition causes body condition loss, metabolic disease, impaired immunity, reproductive failure, and ultimately starvation — significant welfare compromises. Overnutrition causes obesity, joint stress, and pregnancy toxaemia risk in fat ewes. Meeting sheep nutritional requirements across the production cycle is a core welfare responsibility.

Energy Requirements Across the Production Cycle

Energy requirements vary dramatically across sheep's productive cycle:

• Maintenance: Minimum requirement for non-productive adult sheep — typically met by moderate-quality pasture or hay
• Early pregnancy (weeks 1-15): Requirements barely above maintenance; overfeeding creates fat ewes at risk from pregnancy toxaemia
• Late pregnancy (weeks 15-term): Requirements rise sharply as fetal growth accelerates — 150-180% of maintenance for twin-bearing ewes. Glucose demand from multiple fetuses creates ketosis/pregnancy toxaemia risk if energy supply inadequate
• Early lactation: Peak energy demand of the productive cycle — 200-250% of maintenance. Energy deficit drives rapid body condition loss; severely thin ewes cannot sustain adequate milk production

Body Condition Scoring

BCS (1-5 scale in UK sheep) is the primary nutritional welfare indicator. Ewes should score 3.0-3.5 at tupping, maintain 2.5-3.0 during pregnancy, and not fall below 2.0 at lambing. Regular BCS monitoring (at tupping, mid-pregnancy, pre-lambing, and weaning) enables targeted supplementation before welfare-compromising condition loss occurs.

Pregnancy Toxaemia (Twin Lamb Disease)

Pregnancy toxaemia is the most serious nutritional welfare emergency in sheep, caused by insufficient glucose supply to ewes carrying multiple fetuses in late pregnancy. Signs include: depression, separation from flock, star-gazing, head pressing, inability to rise, coma, and death. Risk factors: twin/triplet-bearing ewes, under-nutrition in late pregnancy, fat or thin ewes, adverse weather, and stress.

Treatment with propylene glycol, glucose infusions, and supportive care must be aggressive and immediate; untreated pregnancy toxaemia is fatal. Prevention through appropriate late-pregnancy nutrition guided by ultrasound scanning is far preferable.

Trace Element Deficiencies

Selenium, cobalt, copper, and iodine deficiencies cause welfare-significant problems in sheep. White muscle disease (selenium/vitamin E deficiency) affects newborn lambs, causing muscular weakness and inability to stand. Cobalt deficiency ('pine') causes wasting and immunosuppression. Regional soil deficiencies require strategic supplementation through boluses, water medication, or feed incorporation.

Water Requirements

Water is often underappreciated as a welfare nutrient. Lactating ewes require 4-5 litres/day; pregnant ewes 2-3 litres. Water deprivation of even 24 hours causes significant stress and reduced feed intake. Multiple clean water sources, adequate flow rates, and frost protection in winter maintain water welfare.

This page is part of the Animal Welfare Hub — providing evidence-based information to improve the lives of animals. Return to home.