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Effects of dietary concentrate level on tissue and organ mass of Alpine does at different stages of lactation

A. T. Ngwa, L. J. Dawson, R. Puchala, G. Detweiler, R. C. Merkel, T. Sahlu, C. L. Ferrell, and A. L. Goetsch

Journal of Animal Science 85(Supplement 1):45. 2007

Multiparous Alpine does (42) were used to determine how dietary concentrate level and stage of lactation affect mass of organs and tissues. Measures were made with six does a few days after kidding (0 wk). Eighteen does were fed a 60% concentrate diet (C) and 18 received one based on forage (20% concentrate; F) for 8, 16, or 24 wk of lactation. Intake of DM was greater (P < 0.05) for F vs C (2.23, 2.14, 2.10, 2.42, 2.81, and 2.55 kg/d), ADG was affected (P < 0.07) by an interaction between diet and time (0, 24, 121, -61, 46, and 73 g), and 4% fat-corrected milk was less (P < 0.05) in wk 17-24 than earlier (3.60, 2.78, and 2.45 kg/d for C and 3.02, 3.00, and 2.14 kg/d for F in wk 1-8, 9-16, and 17-24, respectively). Measures at 0 wk in % empty BW (EBW) included 51.1% carcass, 2.01% liver, 14.88% internal fat, and 6.57% gastrointestinal tract (GIT). Carcass mass was greater (P < 0.05) for F vs C and similar among times (50.8, 52.1, and 51.2% EBW for C and 52.6, 53.0, and 52.2% EBW for F at 8, 16, and 24 wk, respectively). Liver mass was similar between diets (P = 0.13) and greatest among times (P < 0.05) at 8 wk (2.87, 2.46, and 2.23% EBW for C and 2.81, 2.63, and 2.58% EBW for F at 8, 16, and 24 wk, respectively). Internal fat mass was greatest among times (P < 0.05) at 24 wk and greater for C vs F (11.40, 14.27, and 18.59% EBW for C and 9.39, 11.43, and 13.70% EBW for F at 8, 16, and 24 wk, respectively). Mass of the GIT was less (P < 0.05) for C than for F and decreased (P < 0.05) with increasing time in lactation (9.26, 7.56, and 6.21% EBW for C and 9.24, 8.50, and 7.87% EBW for F at 8, 16, and 24 wk, respectively). In conclusion, though milk production was not affected by diet partially because of greater DMI for F vs C, based on tissue mass more energy was expended by the GIT of F vs C does. In this regard, it appears that considerable internal fat is mobilized in early lactation particularly with forage-based diets, with more rapid and a greater magnitude of repletion by does consuming diets with high vs moderate or low concentrate levels.


 

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