The comparative performance of tropical crossbred and local shorthorn beef cattle on native pasture at Katherine, NT

1967 ◽  
Vol 7 (26) ◽  
pp. 217 ◽  
Author(s):  
MJT Norman
Keyword(s):  
Heat Stress ◽  
Body Temperature ◽  
Peanut Meal ◽  
Average Weight ◽  
Wet Season ◽  
Comparative Performance ◽  
Native Pasture ◽  
Weight Gains ◽  
Adaptation To Heat ◽  
Dressing Percentage

The liveweight performance and carcase characteristics of Brahman x Hereford, Africander x Hereford and Africander x Shorthorn F, crossbred spayed heifers were compared with those of local Shorthorn spayed heifers on native pasture at Katherine, N.T., between 1962 and 1965. The breed groups were divided for planes of winter nutrition, viz., with and without 2 lb a day of peanut meal from early June until the start of the wet season. Without supplement, the average weight gains of B x H, A x H, A x S, and Shorthorn cattle between June 1962 and May 1965 were 0.49, 0.37, 0.36, and 0.23 lb a day respectively. With supplement, cattle reached slaughter weight a year earlier ; the average weight gains of B x H, A x H, and Shorthorn cattle between June 1962 and May 1964 were 0.61, 0.63, and 0.50 lb a day respectively. (There was no A x S supplemented group). Without supplement, the dressing percentage and estimated proportion of fat of B x H cattle was higher and the estimated proportion of muscle and bone lower than those of other breeds. With supplement, there were no significant differences in dressing percentage or carcase composition between breeds. Measurements made of thermoregulatory attributes indicated that the local Shorthorn cattle, through body temperature control, showed adaptation to heat stress.

The effect of a phosphorus supplement on the performance of steers grazing Townsville stylo-based pasture in north Queensland

1977 ◽  
Vol 17 (86) ◽  
pp. 357 ◽  
Author(s):  
L Winks ◽  
FC Lamberth ◽  
PK O'Rourke
Keyword(s):  
Dry Season ◽  
Wet Season ◽  
Dry Tropics ◽  
Stylosanthes Humilis ◽  
Native Pasture ◽  
Weight Gains ◽  
Annual Grasses ◽  
Townsville Stylo

The effect of phosphorus supplementation on the performance of steeres grazing unfertilized native pasture and Townsville stylo (Stylosanthes humilis) with andwithout superphosphate fertilizer on the subcoastal spear grass region of the dry tropics of north Queensland was studied over a period of 40 months. Liveweight gains in the absence of supplementation on fertilized Townsville stylo pastures were greater than on unfertilized Townsville stylo, where performance was similar to that recorded on untreated native pasture. Phosphorus supplementation increased weight gains during the wet season on both unfertilized Townsville stylo and native pasture but had no significant effect on dry season performance or performance on fertilized Townsville stylo. Fertilized areas became dominated by annual grasses, Digitaria ciliaris and Brachiaria milliiformis, and legume yields were higher on unfertilized than on fertilized areas. Fertilizer improved the quality of available pastures.

Seasonal performance of beef cattle on native pasture at Katherine, N.T

1965 ◽  
Vol 5 (18) ◽  
pp. 227 ◽  
Author(s):  
MJT Norman
Keyword(s):  
Beef Cattle ◽  
Nitrogen Content ◽  
Effective Rainfall ◽  
Wet Season ◽  
Seasonal Performance ◽  
Native Pasture ◽  
Weight Gains ◽  
The Mean ◽  
Gain And Loss

Nine years' data on the liveweight of beef cattle steers from 1 to 4 years of age carried on native pasture at Katherine, N.T., are summarized. Cattle began to gain weight at the start of the main flush of wet season pasture growth, following effective rainfall of two inches or more in the previous fortnight, on a mean date of November 27. Weight gains continued until shortly after the end of the wet season, on a mean date of May 23. Maximum rates of gain were reached in January, maximum rates of loss in November. The mean net annual liveweight gain was only 107 lb. Variation in rates of gain and loss throughout the pear were largely related to changes in the nitrogen content of the pasture.

scholarly journals Effects of heat stress on mammalian reproduction

2009 ◽  
Vol 364 (1534) ◽  
pp. 3341-3350 ◽  
Author(s):  
Peter J. Hansen
Keyword(s):  
Heat Stress ◽  
Elevated Temperature ◽  
Body Temperature ◽  
Reproductive Function ◽  
Early Embryo ◽  
Oxygen Species ◽  
Stressed Animal ◽  
Adaptation To Heat ◽  
Physiological Adjustments ◽  
Regulate Body Temperature

Heat stress can have large effects on most aspects of reproductive function in mammals. These include disruptions in spermatogenesis and oocyte development, oocyte maturation, early embryonic development, foetal and placental growth and lactation. These deleterious effects of heat stress are the result of either the hyperthermia associated with heat stress or the physiological adjustments made by the heat-stressed animal to regulate body temperature. Many effects of elevated temperature on gametes and the early embryo involve increased production of reactive oxygen species. Genetic adaptation to heat stress is possible both with respect to regulation of body temperature and cellular resistance to elevated temperature.

Dry season protein and energy supplements for beef cattle on native pastures at Katherine, N.T

1963 ◽  
Vol 3 (11) ◽  
pp. 280 ◽  
Author(s):  
MJT Norman
Keyword(s):  
Beef Cattle ◽  
Peanut Meal ◽  
Dry Season ◽  
High Protein ◽  
Wet Season ◽  
Protein Supplements ◽  
Native Pasture ◽  
Native Pastures ◽  
Sorghum Grain ◽  
Energy Supplements

Three experiments planned to gain information on the gross nutritive deficiencies of native pasture as a feed for beef cattle during the dry season were carried out at Katherine, N.T., between 1960 and 1962. Groups of local Shorthorn steers were grazed on native pasture from July to November and fed supplements of crushed sorghum grain and peanut meal at different levels of total digestible nutrients and digestible crude protein. The results suggest that up to the time of early storm rains, prior to the wet season proper, the dry standing native pasture is an adequate source of energy, which can be effectively utilized if cattle are given a small quantity of high-protein supplement. During the period of early rains, the pasture is not an adequate source of energy, and high-protein supplements do not prevent liveweight loss. High spring temperatures before the early rains did not appear to affect adversely the performance of supplemented cattle.

scholarly journals EFEK IKLIM KERJA PANAS PADA RESPON FISIOLOGIS TENAGA KERJA DI RUANG TERBATAS

2018 ◽  
Vol 6 (2) ◽  
pp. 207
Author(s):  
Jesika Wulandari ◽  
Meirina Ernawati
Keyword(s):  
Blood Pressure ◽  
Heat Stress ◽  
Body Temperature ◽  
Pulse Rate ◽  
Physiological Responses ◽  
Average Weight ◽  
Confined Space ◽  
Cross Sectional ◽  
Temperature Pulse ◽  
Before And After

ABSTRACT Effects heat stress on physiological responses can be seen on increase body temperature, pulse rate and blood pressure (systole and diastole) and also weight loss. The aim of this study is to analyze the physiological responses of workers exposed to heat in confined space heater PT Nippon Shokubai Indonesia. This was an observational study with cross-sectional design. The sample was all of population (10 workers). Data was collected by measuring heat stress (WBGT), physiological responses before and after working and also questionnaire of individual factors. The result of heat stress measurement show that average of WBGT is above the Threeshold Limit Value (34,9OC) with the workload of the workers was in the heavy category (461,94 ccal) and work time category 0-25%. The result showed that the average body themperature before working was 36,73oC and after working was 38,13oC. The average pulse rate before working was 90,85 beats per minute and after working was 96,1 beats per minutes. The average systolic and diastolic blood pressure before working was 124,85 mmHg and 72,05 mmHg and the average after working was 126,05 mmHg and 72,45 mmHg. On the other hand, the average weight before working was 59,58 kg and after working was 58,3 kg. Hence, there were difference on the result of body temperature, pulse rate, blood pressure and weight before and after working in CS heater.Keyword:   Heat stress, physiological response, confined spaceABSTRAKEfek dari iklim kerja panas pada respon fisiologis tenaga kerja dapat dilihat pada peningkatan suhu tubuh, denyut nadi, tekanan darah (sistolik dan diastolik) dan juga penurunan berat badan. Tujuan dari penelitian ini adalah untuk menganalisis respon fisiologis tenaga kerja akibat iklim kerja panas di confined space heater PT. Nippon Shokubai Indonesia. Penelitian ini bersifat observasional dengan desain cross-sectional. Besar sampel adalah keseluruhan populasi yaitu 10 orang. Data didapatkan dari pengukuran mengukur iklim kerja panas (ISBB), respon fisiologis sebelum dan sesudah bekerja dan juga kuesioner faktor individu. Hasil pengukuran iklim kerja panas menunjukkan bahwa rerata nilai ISBB sebesar 34,9OC sehingga telah melebihi Nilai Ambang Batas dengan beban kerja berat yaitu 461,94 kkal dan kategori waktu kerja 0-25%. Hasil menunjukkan bahwa rerata suhu tubuh sebelum bekerja adalah 36,73oC dan sesudah bekerja adalah 38,13oC. Rerata denyut nadi sebelum bekerja adalah 90,85 denyut per menit dan sesudah bekerja adalah 96,1 denyut per menit. Kemudian rerata tekanan darah sistolik dan diastolik sebelum bekerja adalah 124,85 mmHg dan 72,05 mmHg, dan rerata sesudah bekerja adalah 126,06 mmHg dan 72,45 mmHg. Selain itu rerata berat badan sebelum bekerja adalah 59,85 kg dan sesudah bekerja adalah 58,3 kg. Oleh karena itu, terdapat perbedaan antara suhu tubuh, denyut nadi, tekanan darah (sistolik dan diastolik) dan berat badan sebelum dan sesudah bekerja di CS heater.Kata kunci : Iklim kerja panas, respon fisiologis, ruang terbatas

scholarly journals Heat Stress and Cardiovascular, Hormonal, and Heat Shock Proteins in Humans

2012 ◽  
Vol 47 (2) ◽  
pp. 184-190 ◽  
Author(s):  
Masaki Iguchi ◽  
Andrew E. Littmann ◽  
Shuo-Hsiu Chang ◽  
Lydia A. Wester ◽  
Jane S. Knipper ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Heat Stress ◽  
Heat Shock ◽  
Body Temperature ◽  
Controlled Trial ◽  
Whole Body ◽  
Cord Injury ◽  
Whole Body Heat Stress ◽  
Body Heat

Context: Conditions such as osteoarthritis, obesity, and spinal cord injury limit the ability of patients to exercise, preventing them from experiencing many well-documented physiologic stressors. Recent evidence indicates that some of these stressors might derive from exercise-induced body temperature increases. Objective: To determine whether whole-body heat stress without exercise triggers cardiovascular, hormonal, and extra-cellular protein responses of exercise. Design: Randomized controlled trial. Setting: University research laboratory. Patients or Other Participants: Twenty-five young, healthy adults (13 men, 12 women; age = 22.1 ± 2.4 years, height = 175.2 ± 11.6 cm, mass = 69.4 ± 14.8 kg, body mass index = 22.6 ± 4.0) volunteered. Intervention(s): Participants sat in a heat stress chamber with heat (73°C) and without heat (26°C) stress for 30 minutes on separate days. We obtained blood samples from a subset of 13 participants (7 men, 6 women) before and after exposure to heat stress. Main Outcome Measure(s): Extracellular heat shock protein (HSP72) and catecholamine plasma concentration, heart rate, blood pressure, and heat perception. Results: After 30 minutes of heat stress, body temperature measured via rectal sensor increased by 0.8°C. Heart rate increased linearly to 131.4 ± 22.4 beats per minute (F6,24 = 186, P < .001) and systolic and diastolic blood pressure decreased by 16 mm Hg (F6,24 = 10.1, P < .001) and 5 mm Hg (F6,24 = 5.4, P < .001), respectively. Norepinephrine (F1,12 = 12.1, P = .004) and prolactin (F1,12 = 30.2, P < .001) increased in the plasma (58% and 285%, respectively) (P < .05). The HSP72 (F1,12 = 44.7, P < .001) level increased with heat stress by 48.7% ± 53.9%. No cardiovascular or blood variables showed changes during the control trials (quiet sitting in the heat chamber with no heat stress), resulting in differences between heat and control trials. Conclusions: We found that whole-body heat stress triggers some of the physiologic responses observed with exercise. Future studies are necessary to investigate whether carefully prescribed heat stress constitutes a method to augment or supplement exercise.

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