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Development of a Neonatal Piglet Acute Lung Injury Model Recreating the Early Environment of Preterm Infant Lungs

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Published on: October 31, 2025

Factors associated with neonatal lamb mortality.

E M Huffman¹, J H Kirk, M Pappaioanou

¹Veterinary Medical Health Management P.O. Box 1688, Hanford, CA 93232 USA.

|August 1, 1985

Summary

Lamb birthweight, litter size, and sex impact neonatal lamb mortality. Birthweight is the strongest predictor, with 14.3% overall mortality, often due to starvation within four days.

Area of Science:

Veterinary Medicine
Animal Science
Reproductive Biology

Background:

Neonatal lamb mortality significantly impacts flock productivity and economic viability.
Understanding the primary drivers of mortality is crucial for implementing effective management strategies.

Purpose of the Study:

To identify key factors influencing neonatal lamb mortality.
To determine the predictive power of birthweight, litter size, and lamb sex on survival rates.

Main Methods:

Retrospective analysis of lamb mortality data.
Statistical association testing to identify significant risk factors.
Calculation of neonatal mortality rates and age-specific mortality.

Main Results:

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Neonatal mortality rate was 14.3%.
Birthweight (P<0.003), number of lambs born per ewe (P<0.001), and lamb sex (P<0.32) were associated with mortality.
Lamb birthweight demonstrated the highest predictive power for survival.
Starvation was linked to 58.3% of lamb deaths (P < 0.05).
Seventy-nine percent of deaths occurred within the first four days post-birth.

Conclusions:

Lamb birthweight is a critical determinant of neonatal survival.
Early mortality is strongly associated with birthweight and litter size.
Starvation is a major contributing factor to early lamb deaths, highlighting the need for nutritional support.