Holstein steers grazing two Bermudagrass varieties in hot and dry summer: forage quality and physiological responses of steers

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Leonel Avendano


The objective was to evaluate the forage quality of two varieties of Bermudagrass and some physiological traits of Holstein steers during two grazing periods in summer in an arid zone. Twenty-four Holstein steers (BW=200 ± 5 kg), 20 intact animals and 4 with rumen cannulas were randomly assigned for grazing to the Bermudagrass varieties Cross 1 (BC1, n=12) and Giant (BG, n=12) in two consecutive periods (P1 and P2) during summer-fall season in northwestern México. Based on THI estimation, climate in P1 was considered as severe heat stress and P2 as moderate heat stress. Levels of CP and ash were higher (P˂0.05) in BG during P2. Contents of NFD, AFD, and hemicellulose were higher (P˂0.01) in BG and P2 than BC1 and P1, respectively. Only fat content was higher (P˂0.05) in BC1 than BG. The in vitro digestibility of dry and organic matters showed no differences (P>0.05) between varieties or periods. Respiration frequency and all body surface temperatures were higher during the first grazing period and at the afternoon, which agrees with the hottest grazing period and time of day. In conclusion, climatic conditions of the site of the study along with a poor quality of Giant and Cross 1 Bermudagrass varieties under grazing conditions, make the nutritional supplement recommended to reach satisfactory results for growing cattle.

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How to Cite
Avendano, L., Aguilar-Quiñonez, J. A., Joseph, M., Macías-Cruz, U., Guerra-Liera, J. E., Alvarez-Almora, E., Correa-Calderón, A., & Wittayakun, S. (2021). Holstein steers grazing two Bermudagrass varieties in hot and dry summer: forage quality and physiological responses of steers. Journal of Science and Agricultural Technology, 2(2), 32–42. Retrieved from https://ph02.tci-thaijo.org/index.php/JSAT/article/view/244751
Research Article
Author Biographies

Antonio, Universidad Autonoma de Sinaloa

José Antonio earned his Ph.D. at the University of Sinaloa in the area of Animal Physiology, with emphasis in ruminants.

Marlene, Universidad Autonoma de Baja California

Marlene earned his master degree at the Animal Production Systems at the University of Baja California. She is working now for the Rancho Nuevo Feedlot in Mexicali, México.

Ulises, Universidad Autonoma de Baja California

Dr. Macías-Cruz is a full time professor at the Instituto de Ciencias Agricolas of the University of Baja California in the area of Animal Physiology. 

Juan, Universidad Autonoma de Sinaloa

Dr. Guerra-Liera is a full time professor at the Agronomy Faculty of the University of Sinaloa. His area is Animal Nutrition and work with ruminants.

Enrique, Universidad Autonoma de Baja California

Dr. Alvarez-Almora is a retireed professor from the University of Baja California. He worked in the area of Animal Nutrition, in the subarea of forages and irrigated pastures. 

Abe, Universidad Autonoma de Baja California

Abelardo is a full time professor at the University of Baja California and works in the area of Animal Physiology using cattle as animal model.

Suntorn, Rajamangala University of Technology Lana

Dr. Wittayakun is an Associate Professor and Dean of the Dean  Faculty of Science and Agricultural Technology, in the Rajamangala University of Technology Lanna, Thailand.


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