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Effects of shearing on energy use by growing Angora goats

R. Puchala, A. Helal, A. L. Goetsch, and T. Sahlu

Journal of Animal Science 88(E-Supplement 2):454-455. 2010

Eight Angora wethers (initial BW 19.0 1.14 kg) and 8 doelings (initial BW 16.3 1.15 kg), approximately 17 mo of age, were used to assess effects of shearing on energy expenditure (EE) and heart rate (HR). Animals were fed a pelleted diet at 1100 h to achieve 12.5 g/d tissue gain and 7.5 g/d mohair fiber growth. Animals were placed in an indirect, open-circuit respiration calorimetry system in 4-animal sets (2 wethers and 2 doelings) for gas exchange measurement 1 d before (d 0) and for 3 d after shearing (d 1, 2, 3). Temperature and relative humidity were controlled at 20?C and 50%, respectively. Shearing was at 0900 h. To avoid effects of feeding on HR and EE, data collected during the daytime (0800 to 1900 h) were omitted. Energy expenditure was greater (P < 0.05) after than before shearing (3.48, 4.30, 4.01, and 3.82 MJ/d on d 0, 1, 2, and 3, respectively; SEM = 0.142). Similarly, HR (92.6, 104.8 97.5, and 100.0 beats/min; SEM = 3.02) and EE relative to metabolic size (405, 503, 468, and 448 kJ/kg BW0.75 on d 0, 1, 2, and 3, respectively; SEM = 10.8) were affected (P < 0.05) by shearing. The ratio of EE to HR was similar among days after shearing (4.45, 4.87, 4.87, and 4.52 kJ/kg body weight0.75 per heart beat on d 0, 1, 2, and 3, respectively; SEM = 0.151). A decline (P < 0.05) in respiratory quotient after shearing (1.049, 1.034, 1.016, and 1.015 on d 0, 1, 2, and 3, respectively; SEM = 0.0079) suggests increased body fat catabolism. Regression analysis indicated that more than 4 d would be required for EE and HR to return to pre-shearing levels. In conclusion, even with non-stressful environmental conditions, shearing Angora goats increases energy consumption.


 

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