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Effects of dietary protein and ruminally protected betaine or choline on productivity of Angora doelings

R. Puchala, V. Banskalieva, A. L. Goetsch, I. Prieto, and T. Sahlu

E (Kika) de la Garza Institute for Goat Research, Langston University, Langston, OK

Thirty Angora doelings (22 ± 2 kg initial BW, 6 mo) were used in an experiment with a 2 × 3 factorial arrangement of treatments to investigate the effects of dietary protein level (9 and 15% CP, 2.4 Mcal/kg ME) and supplementation with ruminally protected choline (6 g/d) or ruminally protected betaine (6 g/d) or control (no supplementation) on ADG and mohair growth. Goats were housed in pens (seven or eight per pen) and given ad libitum access to the diet using electronic feeders for 120 d. There was a dietary protein × supplement interaction (P < 0.05) in ADG. Animals fed 9% CP-control and 9% CP-choline diets had lower (P < 0.001) ADG (46.7 and 52.1 g/d) than ones consuming the 9% CP-betaine diet (78.8 g/d). There were no differences in ADG (P > 0.26) among animals fed 9% CP-betaine, 15% CP-control (74.8 g/d), 15% CP-betaine (83.8 g/d), or 15% CP-choline (85.0 g/d) diets. Neither DMI nor mohair growth were affected by dietary treatments (P > 0.05). It is suspected that increased ADG with betaine supplementation of this low protein diet was due to the additional methyl groups, which can be used for homocysteine remethylation and carnitine synthesis (lipid transporter). Supplementation with ruminally protected betaine may be useful to increase efficiency of utilization of poor quality, low protein diets.


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