Colostrum production by ewes and the amounts ingested by lambs

Area of Science:

• Reproductive physiology
• Animal science
• Veterinary medicine

Background:

• Maternal nutrition significantly impacts pregnancy outcomes and offspring health.
• Colostrum is vital for neonatal lamb immunity and nutrition.
• Understanding colostrum dynamics is crucial for optimizing lamb survival rates.

Purpose of the Study:

• To investigate the relationship between ewe nutrition during late pregnancy and lamb birth weight.
• To quantify colostrum production in ewes and its relationship with lamb demand.
• To determine the influence of litter size on colostrum intake and its correlation with neonatal lamb immunoglobulin levels.

Main Methods:

• 49 ewes were monitored for weight changes during the last eight weeks of gestation.
• Colostrum production was measured for 48 hours post-suckling.
• Lamb colostrum intake was assessed in relation to litter size.
• Immunoglobulin levels in lamb circulation were analyzed.

Main Results:

• Ewe weight loss and lamb birth weights were within normal ranges.
• Colostrum production varied (1238-4593 g/ewe) and appeared demand-driven by lambs.
• Lambs from smaller litters ingested greater quantities of colostrum.
• No definitive link was found between colostrum quantity consumed and circulating immunoglobulin levels in lambs.

Conclusions:

• Adequate ewe nutrition supports normal pregnancy and birth outcomes.
• Lambs' colostrum intake is influenced by litter size, suggesting compensatory feeding in smaller litters.
• Further research is needed to elucidate the factors affecting immunoglobulin transfer from colostrum to lamb circulation.