The Use of Attractants to Stimulate Neonatal Piglet Interest in Rope Enrichment

SIMPLE SUMMARY: Piglet crushing is one of the leading causes of preweaning mortality. This loss represents reduced production efficiency, substantial economic losses for producers, and is an animal welfare concern. The goal of this study was to determine if enrichment ropes would entice neonatal piglets away from the sow and reduce preweaning mortality. Three treatments (OIL: sunflower oil; MC: milky cheese; SC: semiochemical) were applied to the enrichment ropes to increase attractiveness to piglets. Results indicate that neonatal piglets were interested in all enrichment treatments on Day 2 of life, although there was high individual variation in frequency and duration of interactions. Enrichment treatment did not impact the frequency or duration of rope interactions or litter average weight gain. Piglet mortality was impacted by treatment: MC piglets had the lowest percent mortality during the enrichment period, and SC piglets had the lowest percent mortality over the entire experimental period. This proof-of-concept study highlights the value of neonatal piglet environmental enrichment. ABSTRACT: In the United States swine industry, preweaning mortality represents the highest mortality rate of any production phase, nearly half attributed to crushing. The overarching aim of this study was to determine if enrichment ropes would entice neonatal piglets away from the sow and reduce preweaning mortality. Rope enrichments were provided to 161 piglets from 26 sows after farrowing. Ropes were dipped in sunflower oil (n = 7), semiochemical (n = 8), or milky cheese (n = 11). Piglet purposeful rope investigations, weight gain, and mortality were recorded. On Day 2, 75% of piglets touched the enrichment at least once, and frequency ranged from 1 to 21 investigations across all treatments. Frequency (p = 0.20) and duration (p = 0.21) of investigations were not affected by treatment. Preweaning litter average weight gain did not differ between treatments (p = 0.71). MC (milky cheese) piglets had the lowest percent mortality when the enrichment ropes were present (Days 2 to 5, p = 0.01), and SC (semiochemical) piglets had the lowest percent mortality after the enrichment ropes were removed (Days 6 to weaning, p < 0.0001). This proof-of-concept study highlights the potential value of neonatal piglet environmental enrichment.