Tolerance to heat and atmospheric humidity of different breeds groups of cattle
Journal Title: Revista MVZ Cordoba - Year 2011, Vol 16, Issue 1
Abstract
Objective. The objective of the present study was to compare some physiological responses to heat and atmospheric humidity among Chinampos (Bos Taurus; Ch), ½ Charolais ½ Brahman (CB), Holstein (H) and Jersey (J) cattle. Materials and methods. The study was carried out in La Paz, Mexico; 12 H, 10 J, 15 Ch and 8 CB cows were used. During the summer the respiratory frequency (RF) and rectal temperature (RT) were measured each week (at 0600 and 1600 hours). The climatic variables were measured to calculate the temperature-humidity index (THI). Results. Throughout the summer, the RF was above the physiological values of cattle in the four groups, being higher in H and J than in Ch and CB (p<0.01). In all groups, the RT was within the physiological limits of cattle. The most affected group was H (p<0.05). When the physiological constants were analyzed within each of the three categories of THI (<72, ≥72<78, and ≥78), the H and J cows presented higher RF than that of Ch and CB (p<0.01). The RT increased as the THI rose, being more pronounced in J and H. Increase in the RF between the morning and the afternoon of each day of measurement was higher in H and J than in Ch and CB (p<0.05). The RT increased more in H than in Ch (p<0.05). Conclusions. The breed groups most tolerant to heat stress, based on RF and RT, were Ch and CB.
Authors and Affiliations
José Espinoza V, Ph. D *| Universidad Autónoma de Baja California Sur. Departamento de Zootecnia. Cuerpo Académico Producción Animal Sustentable. Carretera al Sur, km. 5.5, La Paz, B.C.S., México.correspondencia: jlvilla@uabcs.mx, Ricardo Ortega P, M. Sc| Universidad Autónoma de Baja California Sur. Departamento de Zootecnia. Cuerpo Académico Producción Animal Sustentable. Carretera al Sur, km. 5.5, La Paz, B.C.S., México., Alejandro Palacios E, Ph. D| Universidad Autónoma de Baja California Sur. Departamento de Zootecnia. Cuerpo Académico Producción Animal Sustentable. Carretera al Sur, km. 5.5, La Paz, B.C.S., México., Ariel Guillén T, Ph. D| Universidad Autónoma de Baja California Sur. Departamento de Zootecnia. Cuerpo Académico Producción Animal Sustentable. Carretera al Sur, km. 5.5, La Paz, B.C.S., México.
Keywords
Related Articles
- EP ID EP3183
- DOI -
- Views 394
- Downloads 22
IN VITRO ASSESSMENT OF NEMATOPHAGUS FUNGI FOR BIOLOGICAL CONTROL OF GASTROINTESTINAL NEMATODES OF RUMINANTS
Objetive. To determine in vitro predatory activity of fungi strains nematófagos native of Costa Rica. Materials and methods. Sixteen native strains of nematophagus fungi from Costa Rica isolated from different substrata...
The effect of Glycoline® on reproductive efficiency in high-producing dairy cows
Objective. Determine the effect of Glycoline® on reproductive efficiency in high producing dairy cows. Materials and methods. 100 Holstein cows one month before delivery were selected. About 21 days before parturition th...
Serum antibodies against Newcastle disease and Avian Influenza in birds of pley in Chile
Objective. To detect the presence of blood serum antibodies against Newcastle disease (ND) and Avian influenza (AI) viruses, to understand the contribution of wild birds in transmission of these viruses in Chile. Materia...
The use of conantokin and polyclonal antibodies to identify the NR2B subunit of the n-methyl-d-aspartate receptor
Objective. To propose a methodology that identifies the NR2B subunit through the use of conantokin G, as well as an adequate extraction of the NR2B subunit. Materials and methods. Two methodologies were tested for the ex...
EXPERIMENTAL CULTURE OF CLADOCERANS Moina sp FEED WITH Ankistrodesmus sp and Saccharomyces cereviseae
Objetive. Realize an experimental cuculture of cladorerans Moina sp feed with Ankistrodesmus sp and Saccharomyces cereviseae. Materials and methods. At Universidad de Córdoba, Laboratory of Food Live, experimental cultiv...