JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Effects of Heat Exposure and Restricted Feeding on Behavior, Digestibility and Growth Hormone Secretion in Goats
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Effects of Heat Exposure and Restricted Feeding on Behavior, Digestibility and Growth Hormone Secretion in Goats
Hirayama, Takuji; Katoh, Kazuo;
  PDF(new window)
 Abstract
Heat stress is known to affect physiological systems in goats. This study investigated changes in nutrient digestibility, behavior and growth hormone secretion among goats in a hot environment (H; 35 1.2, [RH] 807.2%, 13 d), and in a thermoneutral environment (T; 200.6, [RH] 803.4%, 20 d), and accompanied by the same restricted diet as provided in the hot environment. The following results were obtained: rectal temperature and water intake were higher in the H treatment than in the T treatment or TR treatment, while hay consumption was lower. CP, NDF and ADF digestibility was highest in H treatment. Time spent eating in the H treatment was also the highest, followed in order by T treatment and TR treatment. Ruminating time was lower in H treatment than in T treatment or TR treatment, and reposing time was highest in the TR treatment. Growth hormone concentrations in T increased 4.5 h after feeding. In H, growth hormone concentrations increased 0.5 h after feeding. However, growth hormone concentrations were not changed following TR feeding. In conclusion, heat exposure in goats decreased feed intake, but increased digestibility. However, when goats in a thermoneutral environment received the same restricted feeding as they received in the hot environment, digestibility increased. Between the H treatment and TR treatment, the changes in digestibility were accomplished by coordinate changes in hormone secretion in order to maintain body homeostasis. To maintain energy balance under a hot temperature or a restricted feeding condition, goats may control their metabolism by changing growth hormone release.
 Keywords
GH Secretion;Goat;Heat Stress;Feed Restriction;
 Language
English
 Cited by
1.
Pineal-adrenal Relationship: Modulating Effects of Glucocorticoids on Pineal Function to Ameliorate Thermal-stress in Goats,;;;

아세아태평양축산학회지, 2008. vol.21. 7, pp.988-994 crossref(new window)
2.
Effects of Restricted Feeding on Intake, Digestion, Nitrogen Balance and Metabolizable Energy in Small and Large Body Sized Sheep Breeds,;;

아세아태평양축산학회지, 2009. vol.22. 5, pp.667-673 crossref(new window)
3.
The Effects of Skin Pigmentation on Physiological Factors of Thermoregulation and Grazing Behaviour of Dairy Goats in a Hot and Humid Climate,;;;

아세아태평양축산학회지, 2009. vol.22. 5, pp.727-731 crossref(new window)
 References
1.
AOAC. 1980. Official Method of Analysis (13th edn.). Washington, DC.

2.
Beede, D. K. and R. J. Collier. 1986. Potential nutritional strategies for intensively managed cattle during thermal stress. J. Anim. Sci. 62:543-554.

3.
Colditz, P. J. and R. C. Kellaway. 1972. The effect of diet and heat stress on feed intake, growth and nitrogen metabolism in friesian F1 brahman X friesian, and Brahman heifers. Aust. J. Agric. Res. 23:717-725.

4.
Collier, R. J., S. G. Doelger, H. H. Head, W. W. Thatcher and C. J. Wilcox. 1982. Effects of heat stress during pregnancy on maternal hormone concentrations, calf birth weight and postpartum milk yield of Holstein cows. J. Anim. Sci. 54:309-319.

5.
Fuquay, J. W. 1981. Heat stress as it affects animal production. J. Anim. Sci. 52:164-174.

6.
Goering, H. K. and P. J. Van Soest. 1970. Forage fiber analysis (apparatus, reagents, procedures and some applications). In: Agriculture Handbook. (USDA ed.) 2-9. U.S. Government Printing Office. Washington, DC.

7.
Hayasaka, K. and N. Yamagishi. 1990. Behavioral responses of lactating Holstein cows to rising indoor air temperature in Hokkaido. Jpn. J. Zootech. Sci. 61:690-694.

8.
Hirayama, T., K. Katoh and M. Ohta. 2002. Effects of feeding alfalfa hay and timothy hay on the digestibilities, contract of rumen and excretion movement of feeds of goats on heat exposure. Anim. Sci. J. 73:J95-J101.

9.
Hirayama, T., N. Asato and M. Ohta. 2001. Behavior and ruminal contraction of Japanese black cattle in the summer season. Anim. Sci. J. 72:J605-J609.

10.
Hoshino, S. 1996. Current research on growth hormone (GH) and its function. Anim. Sci. J. 67:J84-J101.

11.
Itoh, F., Y. Obara, H. Fuse, I. Osaka and K. Hodate. 1997. Responses of plasma insulin, glucagons, growth hormone, and metabolites in heifers during cold and heat exposure. Anim. Sci. Technol. (Jpn.) 68:727-734.

12.
Knapp, D. M. and R. R. Grummer. 1991. Response of lactationg dairy cows to fat supplementation during heat stress. J. Dairy Sci. 74:2573-2579.

13.
McGuire, M. A., D. K. Beede, M. A. Delorenzo, C. J. Wilcox, G. B. Huntington, C. K. Reynolds and R. J. Collier. 1989. Effects of thermal stress and level of feed intake on portal plasma flow and net fluxes of metabolites in lactating Holstein cows. J. Anim. Sci. 67:1050-1060.

14.
Mcleod, M. N., P. M. Kennedy and D. J. Minson. 1990. Resistance of leaf and stem fraction of tropical forage to chewing and passage in cattle. Br. J. Nutr. 63:105-119.

15.
Nardone, A., N. Lacetera, U. Bernabucci and B. Ronchi. 1997. Composition of colostrums from dairy heifers exposed to high air temperatures during late pregnancy and the early postpartum period. J. Dairy Sci. 80:838-844.

16.
Olbrich, S. E., F. A. Martz, H. D. Johnson, S. W. Phillips, A. C. Lippincott and E. S. Hilderbrand. 1972. Effect of constant ambient temperatures of 10 C and 31 C on ruminal responses of cold tolerant and heat tolerant cattle. J. Anim. Sci. 34:64-69.

17.
Sano, H., K. Ambo and T. Tsuda. 1985. Blood growth kinetics in whole body and mammary gland of lactating goats exposed to heat. J. Dairy Sci. 68:2557-2564.

18.
SAS. 1988. User's Guide (Release 6.03). SAS Inst. Inc., Cary, NC.