Effects of continuous ivermectin treatment from birth to puberty on growth and reproduction in dairy heifers
The effect of continuous ivermectin treatment from birth to puberty on growth and reproductive performance was studied in Holstein heifer calves grown on pastures in comparison to naturally nematode-infected, untreated animals. Ivermectin effectively abated the presence of nematode eggs in feces. Eg...
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todo:paper_00218812_v77_n6_p1329_Mejia2023-10-03T14:21:47Z Effects of continuous ivermectin treatment from birth to puberty on growth and reproduction in dairy heifers Mejía, M. Gonzalez-Iglesias, A. Díaz-Torga, G.S. Villafañe, P. Formía, N. Libertun, C. Becú-Villalobos, D. Lacau-Mengido, I.M. Dairy Cattle Growth Rate Ivermectin Parasitoses Pelvis Puberty Animalia Bos taurus Bovinae anthelmintic agent ivermectin animal animal disease article cattle cattle disease dairying drug effect feces female growth, development and aging male methodology nematodiasis parasite identification parasitology season sexual maturation Animals Anthelmintics Cattle Cattle Diseases Dairying Feces Female Ivermectin Male Nematode Infections Parasite Egg Count Seasons Sexual Maturation The effect of continuous ivermectin treatment from birth to puberty on growth and reproductive performance was studied in Holstein heifer calves grown on pastures in comparison to naturally nematode-infected, untreated animals. Ivermectin effectively abated the presence of nematode eggs in feces. Eggs per gram (EPG) in parasitized animals increased rapidly from wk 12 to 18 of age and then decreased. Animals treated with ivermectin grew faster than untreated ones, and differences in body weight became significant at 6 wk of life, even before eggs appeared in the feces of either treatment group. Ivermectin-treated heifers reached puberty 3 wk earlier than infected ones as assessed with serum progesterone concentrations (ivermectin, 30.4 ± .8 vs untreated, 33.7 ± 1.3 wk of age). This delay was not directly related to body weight. In addition, pelvic area at 39 wk and at 15 mo of age was increased in treated heifers (8 and 11%, respectively) compared with parasitized animals. No differences in the wither heights were observed. We conclude that ivermectin treatment in dairy heifers may increase growth rate during development, advance the onset of ovarian function, and positively affect yearling pelvic area. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00218812_v77_n6_p1329_Mejia |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Dairy Cattle Growth Rate Ivermectin Parasitoses Pelvis Puberty Animalia Bos taurus Bovinae anthelmintic agent ivermectin animal animal disease article cattle cattle disease dairying drug effect feces female growth, development and aging male methodology nematodiasis parasite identification parasitology season sexual maturation Animals Anthelmintics Cattle Cattle Diseases Dairying Feces Female Ivermectin Male Nematode Infections Parasite Egg Count Seasons Sexual Maturation |
| spellingShingle |
Dairy Cattle Growth Rate Ivermectin Parasitoses Pelvis Puberty Animalia Bos taurus Bovinae anthelmintic agent ivermectin animal animal disease article cattle cattle disease dairying drug effect feces female growth, development and aging male methodology nematodiasis parasite identification parasitology season sexual maturation Animals Anthelmintics Cattle Cattle Diseases Dairying Feces Female Ivermectin Male Nematode Infections Parasite Egg Count Seasons Sexual Maturation Mejía, M. Gonzalez-Iglesias, A. Díaz-Torga, G.S. Villafañe, P. Formía, N. Libertun, C. Becú-Villalobos, D. Lacau-Mengido, I.M. Effects of continuous ivermectin treatment from birth to puberty on growth and reproduction in dairy heifers |
| topic_facet |
Dairy Cattle Growth Rate Ivermectin Parasitoses Pelvis Puberty Animalia Bos taurus Bovinae anthelmintic agent ivermectin animal animal disease article cattle cattle disease dairying drug effect feces female growth, development and aging male methodology nematodiasis parasite identification parasitology season sexual maturation Animals Anthelmintics Cattle Cattle Diseases Dairying Feces Female Ivermectin Male Nematode Infections Parasite Egg Count Seasons Sexual Maturation |
| description |
The effect of continuous ivermectin treatment from birth to puberty on growth and reproductive performance was studied in Holstein heifer calves grown on pastures in comparison to naturally nematode-infected, untreated animals. Ivermectin effectively abated the presence of nematode eggs in feces. Eggs per gram (EPG) in parasitized animals increased rapidly from wk 12 to 18 of age and then decreased. Animals treated with ivermectin grew faster than untreated ones, and differences in body weight became significant at 6 wk of life, even before eggs appeared in the feces of either treatment group. Ivermectin-treated heifers reached puberty 3 wk earlier than infected ones as assessed with serum progesterone concentrations (ivermectin, 30.4 ± .8 vs untreated, 33.7 ± 1.3 wk of age). This delay was not directly related to body weight. In addition, pelvic area at 39 wk and at 15 mo of age was increased in treated heifers (8 and 11%, respectively) compared with parasitized animals. No differences in the wither heights were observed. We conclude that ivermectin treatment in dairy heifers may increase growth rate during development, advance the onset of ovarian function, and positively affect yearling pelvic area. |
| format |
JOUR |
| author |
Mejía, M. Gonzalez-Iglesias, A. Díaz-Torga, G.S. Villafañe, P. Formía, N. Libertun, C. Becú-Villalobos, D. Lacau-Mengido, I.M. |
| author_facet |
Mejía, M. Gonzalez-Iglesias, A. Díaz-Torga, G.S. Villafañe, P. Formía, N. Libertun, C. Becú-Villalobos, D. Lacau-Mengido, I.M. |
| author_sort |
Mejía, M. |
| title |
Effects of continuous ivermectin treatment from birth to puberty on growth and reproduction in dairy heifers |
| title_short |
Effects of continuous ivermectin treatment from birth to puberty on growth and reproduction in dairy heifers |
| title_full |
Effects of continuous ivermectin treatment from birth to puberty on growth and reproduction in dairy heifers |
| title_fullStr |
Effects of continuous ivermectin treatment from birth to puberty on growth and reproduction in dairy heifers |
| title_full_unstemmed |
Effects of continuous ivermectin treatment from birth to puberty on growth and reproduction in dairy heifers |
| title_sort |
effects of continuous ivermectin treatment from birth to puberty on growth and reproduction in dairy heifers |
| url |
http://hdl.handle.net/20.500.12110/paper_00218812_v77_n6_p1329_Mejia |
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