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Influence of dietary protein level on plasma insulin concentration, subcutaneous adipose tissue lipid content and composition in Boer cross and Spanish goats

E. N. Ponnampalam1, R. Puchala1, V. Banskalieva1, L. J. Dawson2, T. Sahlu1, and A. L. Goetsch1

1E (Kika) de la Garza Institute for Goat Research, Langston University, Langston, OK
2College of Veterinary Medicine, Oklahoma State University, Stillwater, OK

Effects of CP level on plasma insulin concentration and s.c. adipose tissue lipid content and composition were examined in Boer cross (BC) and Spanish (SP) goats. Twenty-three BC and 22 SP wethers (4 - 4.5 mo of age; 17.6 and 19.4 kg BW, respectively) were allocated to four dietary treatments. Consumed DM averaged 10, 14, 18, and 23% CP (T1, T2, T3, and T4, respectively). Feed intake was ad libitum and the experiment was 12 wk in length. In wk 11, blood samples were collected 4 h post-feeding for insulin determination. In wk 12, s.c. adipose tissue was biopsied between the ribs 12 and 13 for the determination of lipid content and composition. Diets did not influence DMI or ADG; ADG was 76, 86, 82, and 96 g for T1, T2, T3, and T4, respectively. However, ADG was greater (P < 0.01) for BC than for SP (97 vs 74 g). Dietary protein level did not alter plasma insulin (47.7, 40.2, 39.2, and 39.8 U/mL, respectively), although BC had a lower (P < 0.05) level than SP (36.2 vs 47.3 U/mL, respectively). Total s.c. tissue lipid content was highest (P < 0.01) among treatments for T1 (82.9, 72.5, 71.1, and 70.9%, respectively). Boer cross goats tended (P < 0.08) to have a lower total tissue lipid level (72.6 vs 76.0%) and a higher (P < 0.06) concentration of tissue phospholipids (2.8 vs 1.6%) than SP goats. Goats fed T2 and T4 tended to have a higher (P < 0.08) tissue phospholipid content than those fed T1 and T3 (3.3, 2.8, 1.3, and 1.5%, respectively). Even though T3 and T4 had more CP than recommended for a fast growth rate, they reduced s.c. adipose fat content without increasing ADG. The greater tissue phospholipid content for BC vs SP goats may be associated with increased growth rate, reduced s.c. tissue lipid content, and altered energy metabolism, as phospholipids play a major role in cellular metabolism and functions of membrane proteins.


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