The effect of cattle tick (Boophilus microplus) on the growth of Bos indicus x B. taurus steers
The effect of the tick Boophilus microplus on the liveweight of Bos indicus x B. taurus steers was investigated using three levels of infestation during summer 1980, autumn-winter 1980 and summer 1981. Mean losses in liveweight per engorged female tick during each to the three periods were 0.72, 0.47 and 1.52 g per tick, respectively. The 1980 estimates were significant lower (P less than 0.05) than that in summer 1981, and the losses were independent of tick density. The loss per tick was unaffected by a supplement of molasses and urea in the autumn-winter period. Compensatory growth of those steers whose earlier growth was retarded by poor nutrition or ticks was investigated by keeping all the steers tick-free during spring. The previous medium and high tick groups gained 5-6 kg per animal more than the low group. Non-supplemented animals recovered all of their 14 kg disadvantage compared with the supplemented group. The large variation in losses in liveweight per tick on these animals on the same pastures at different times suggests that differences in published estimates are frequently due to animal variation rather than to nutrition, cattle breed or environment. Economic thresholds were calculated for a range of effects of ticks and of chemical control costs
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1983
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Subjects: | GANADO BOVINO, CRUZAMIENTO, ECTOPARASITOS, GARRAPATAS, BOOPHILUS, GANANCIA DE PESO, PERDIDAS, |
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KOHA-OAI-BVE:437172020-02-03T21:07:14ZThe effect of cattle tick (Boophilus microplus) on the growth of Bos indicus x B. taurus steers 122428 Sutherst, R.W. 92097 Maywald, G.F. 82808 Kerrs, J.D. 121575 Stegeman, D.A. 1983 bThe effect of the tick Boophilus microplus on the liveweight of Bos indicus x B. taurus steers was investigated using three levels of infestation during summer 1980, autumn-winter 1980 and summer 1981. Mean losses in liveweight per engorged female tick during each to the three periods were 0.72, 0.47 and 1.52 g per tick, respectively. The 1980 estimates were significant lower (P less than 0.05) than that in summer 1981, and the losses were independent of tick density. The loss per tick was unaffected by a supplement of molasses and urea in the autumn-winter period. Compensatory growth of those steers whose earlier growth was retarded by poor nutrition or ticks was investigated by keeping all the steers tick-free during spring. The previous medium and high tick groups gained 5-6 kg per animal more than the low group. Non-supplemented animals recovered all of their 14 kg disadvantage compared with the supplemented group. The large variation in losses in liveweight per tick on these animals on the same pastures at different times suggests that differences in published estimates are frequently due to animal variation rather than to nutrition, cattle breed or environment. Economic thresholds were calculated for a range of effects of ticks and of chemical control costsThe effect of the tick Boophilus microplus on the liveweight of Bos indicus x B. taurus steers was investigated using three levels of infestation during summer 1980, autumn-winter 1980 and summer 1981. Mean losses in liveweight per engorged female tick during each to the three periods were 0.72, 0.47 and 1.52 g per tick, respectively. The 1980 estimates were significant lower (P less than 0.05) than that in summer 1981, and the losses were independent of tick density. The loss per tick was unaffected by a supplement of molasses and urea in the autumn-winter period. Compensatory growth of those steers whose earlier growth was retarded by poor nutrition or ticks was investigated by keeping all the steers tick-free during spring. The previous medium and high tick groups gained 5-6 kg per animal more than the low group. Non-supplemented animals recovered all of their 14 kg disadvantage compared with the supplemented group. The large variation in losses in liveweight per tick on these animals on the same pastures at different times suggests that differences in published estimates are frequently due to animal variation rather than to nutrition, cattle breed or environment. Economic thresholds were calculated for a range of effects of ticks and of chemical control costsGANADO BOVINOCRUZAMIENTOECTOPARASITOSGARRAPATASBOOPHILUSGANANCIA DE PESOPERDIDASAustralian Journal of Agricultural Research (Australia) |
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GANADO BOVINO CRUZAMIENTO ECTOPARASITOS GARRAPATAS BOOPHILUS GANANCIA DE PESO PERDIDAS GANADO BOVINO CRUZAMIENTO ECTOPARASITOS GARRAPATAS BOOPHILUS GANANCIA DE PESO PERDIDAS |
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GANADO BOVINO CRUZAMIENTO ECTOPARASITOS GARRAPATAS BOOPHILUS GANANCIA DE PESO PERDIDAS GANADO BOVINO CRUZAMIENTO ECTOPARASITOS GARRAPATAS BOOPHILUS GANANCIA DE PESO PERDIDAS 122428 Sutherst, R.W. 92097 Maywald, G.F. 82808 Kerrs, J.D. 121575 Stegeman, D.A. The effect of cattle tick (Boophilus microplus) on the growth of Bos indicus x B. taurus steers |
description |
The effect of the tick Boophilus microplus on the liveweight of Bos indicus x B. taurus steers was investigated using three levels of infestation during summer 1980, autumn-winter 1980 and summer 1981. Mean losses in liveweight per engorged female tick during each to the three periods were 0.72, 0.47 and 1.52 g per tick, respectively. The 1980 estimates were significant lower (P less than 0.05) than that in summer 1981, and the losses were independent of tick density. The loss per tick was unaffected by a supplement of molasses and urea in the autumn-winter period. Compensatory growth of those steers whose earlier growth was retarded by poor nutrition or ticks was investigated by keeping all the steers tick-free during spring. The previous medium and high tick groups gained 5-6 kg per animal more than the low group. Non-supplemented animals recovered all of their 14 kg disadvantage compared with the supplemented group. The large variation in losses in liveweight per tick on these animals on the same pastures at different times suggests that differences in published estimates are frequently due to animal variation rather than to nutrition, cattle breed or environment. Economic thresholds were calculated for a range of effects of ticks and of chemical control costs |
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GANADO BOVINO CRUZAMIENTO ECTOPARASITOS GARRAPATAS BOOPHILUS GANANCIA DE PESO PERDIDAS |
author |
122428 Sutherst, R.W. 92097 Maywald, G.F. 82808 Kerrs, J.D. 121575 Stegeman, D.A. |
author_facet |
122428 Sutherst, R.W. 92097 Maywald, G.F. 82808 Kerrs, J.D. 121575 Stegeman, D.A. |
author_sort |
122428 Sutherst, R.W. |
title |
The effect of cattle tick (Boophilus microplus) on the growth of Bos indicus x B. taurus steers |
title_short |
The effect of cattle tick (Boophilus microplus) on the growth of Bos indicus x B. taurus steers |
title_full |
The effect of cattle tick (Boophilus microplus) on the growth of Bos indicus x B. taurus steers |
title_fullStr |
The effect of cattle tick (Boophilus microplus) on the growth of Bos indicus x B. taurus steers |
title_full_unstemmed |
The effect of cattle tick (Boophilus microplus) on the growth of Bos indicus x B. taurus steers |
title_sort |
effect of cattle tick (boophilus microplus) on the growth of bos indicus x b. taurus steers |
publishDate |
1983 |
work_keys_str_mv |
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_version_ |
1756053750444720129 |