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Effects of feeding camelina cake to weaned pigs on safety, growth performance, and fatty acid composition of pork.

Feeding cake with remaining oil contributes dietary energy (fat) in addition to protein (AA) and may provide an opportunity to enrich the n-3 fatty acid content of pork. Information regarding safety, growth performance, and efficacy of feeding camelina cake to pigs is limited. We therefore evaluated the effects of camelina cake inclusion in pig nursery diets. In total, 192 pigs (9.4 kg BW) were randomly allocated by sex to 48 pens, 2 heavy and 2 light pigs per pen. Pigs were fed 1 of 4 wheat-based diets including camelina cake (0%, 6%, 12%, or 18%; variety Celine) replacing soybean meal for 4 wk. Individual pigs, pen feed added, and orts were weighed weekly. Feces were collected on d 26 and 27. A blood sample was taken on d 29 from 24 pigs with the lowest BW/pen, which were then euthanized and necropsied. Gross pathological examination was conducted, and organ weights were measured. Samples of liver, back fat, belly fat, and jowl fat were collected for fatty acid analysis. Increasing dietary camelina cake inclusion linearly decreased ( 0.001) apparent total tract digestibility (ATTD) of DM, OM, GE and ash but did not affect ATTD of CP and P. For the entire trial (d 0 to 28), increasing camelina cake inclusion by 6% linearly decreased ( 0.001) ADFI by 74 g/d, ADG by 51 g/d, and BW by 0.8 kg but did not affect feed efficiency (G:F). Increasing camelina cake inclusion linearly increased ( 0.001) liver weight relative to BW, linearly decreased ( 0.050) kidney weight, but did not affect spleen, heart, and thyroid weights. Increasing camelina cake inclusion did not result in serological (large-animal standard panel, T3, and T4) or gross clinical (morphology) findings that might suggest toxicity. In liver, back fat, belly fat, and jowl fat, increasing dietary camelina cake inclusion linearly increased ( 0.050) total n-3 fatty acids and shorter-chain n-3 and n-6 fatty acids but did not increase docosahexaenoic acid (n-3) or arachidonic acid (n-6). In conclusion, feeding camelina cake to weaned pigs at up to 18% did not elicit clinical signs of toxicity and increased n-3 fatty acids in carcass fat depots. The decrease in ADFI as camelina cake inclusion increased resulted in pigs fed 18% weighing 5 kg less than controls at the end of the nursery period.

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