Feeding Cactus (<i>Opuntia stricta</i> [Haw.] Haw.) Cladodes as a Partial Substitute for Elephant Grass (<i>Pennisetum purpureum</i> Schum.) Induces Beneficial Changes in Milk Fatty Acid Composition of Dairy Goats Fed Full-Fat Corn Germ
Agni M. N. Corrêa | Camila S. da Silva | Marco A. S. Gama | Luciana F. P. Soares | Andreia F. de Souza | Michelle C. B. Siqueira | Elizabeth Q. L. de Vasconcelos | Victor J. L. Galeano | Robert E. Mora-Luna | Thayane V. M. Santos | Adriano H. N. Rangel | Marcelo de A. Ferreira
The present study explored the combined effects of CC (<i>Opuntia stricta [Haw.] Haw</i>.) and full-fat corn germ (FFCG) as a source of supplementary PUFA on milk fatty acid (FA) composition of dairy goats fed elephant grass (EG). Twelve Saanen goats were used in a replicated 4 × 4 Latin square design in a 2 × 2 factorial arrangement of treatments (GC or FFCG as energy sources, and the inclusion or not of CC in the diet as a partial substitute for EG). The proportions of various milk FAs were influenced by CC, FFCG, or both. Significant interactions between CC and FFCG were noted for most <i>trans</i>-C18:1 and CLA isomers. Specifically, including CC in the FFCG-supplemented diet increased the levels of <i>trans</i>-11 C18:1 and <i>cis</i>-9, <i>trans</i>-11 CLA in milk fat, whereas these isomers were unchanged or slightly reduced with CC in the GC diet. Similar patterns were observed for C18:2 n-6, while C16:0 increased with CC in the GC diet. Ratios of <i>trans</i>-C18:1/C18:0 and <i>trans</i>-11 C18:1/C18:0 were notably higher when CC was included in the FFCG-supplemented diet. These findings suggest that CC inhibits the last step of rumen biohydrogenation in dairy goats, enriching milk with <i>trans</i>-11 C18:1 and <i>cis</i>-9, <i>trans</i>-11 CLA when supplementary PUFA is provided in the diet.
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