A9X6V5H3

2620

6 janvier 2021 16:24

6 janvier 2021 16:24

In free-range pig production it is important to reduce the input of nutrients from supplementary feed to reduce nutrient leaching and improve the resource efficiency of the system. A promising development might be to encourage foraging behaviour of the pigs. However, very little is known about pigs' ability to take advantage of direct foraging to cover their nutritional needs and how this interacts with breed and affects robustness. Pig performance, plasma concentration of micro nutrients, immune response and faecal microbiota composition were studied in 72 growing pigs (34 to 105kg live weight) of either a traditional (Tamworth×(Landrace×Yorkshire)) or a ‘modern’ crossbreed (Duroc×(Landrace×Yorkshire)) fed a pelleted diet as supplementary feed either according to recommendations (NORM), or restrictedly with (RES+) or without (RES–) a supplementary vitamin and mineral mixture. The pigs ‘strip grazed’ a diverse pasture with a grass–clover mixture and forage herbs (338m2pig–1) and root chicory (34m2pig–1). The results revealed that a 33% reduction in feed allowance of a pelleted diet reduced daily gain with up to 25% but improved conversion of supplementary feed into live weight with up to 15%. There were no significant differences in pig performance between RES+ and RES–. The two breed combinations responded similarly to the reduction in feed allowance with regard to growth performance and feed conversion. Across feeding strategy, the traditional crossbred had 20% lower daily weight gain and used 25% more supplementary feed per kg live weight gain compared to the ‘modern’ crossbreed. Omitting a mineral and vitamin premix to the diet had no consistent effects on plasma concentration of minerals but the plasma concentration of α-tocopherol and retinol were significant lower in RES– pigs compared to RES+ and NORM pigs. Plasma 25-D3 was significant lower in October than in September. The immune response and microbial composition showed few and inconsistent differences between treatments. In conclusion, this study indicated that direct foraging in a diverse range area contributed significantly to the nutritional supply of pigs fed restrictedly with supplementary feed. There are indications that the mineral content of the premix is not needed in a forage-based free-range system but cautious need to be taken with regards to the vitamin A, D, E supply.

None

• AB - Transversal
• FREDO alimentation animale
• FREDO fourrage et prairie
• FREDO mode élevage, bien-être et qualité
• GEO Danemark
• autonomie alimentaire
• breed
• foraging
• porc
• pâturage
• supplementation
• élevage

• free-range
• immune responses
• micro nutrients
• pig performance
• pigs
• traditional genotype

Livestock Science

178

263-271

August 1, 2015

1 août 2015

10.1016/j.livsci.2015.06.010 Le DOI est une URL unique de référencement d'une publication. Il est donc plus fiable et permanent qu'une URL classique

1871-1413 L’ISSN est un code de 8 chiffres servant à identifier les journaux, revues, magazines, périodiques de toute nature et sur tous supports, papier comme électronique.