Pregnancy rate evaluation in lactating and non-lactating Nelore cows subjected to fixed-time artificial insemination using injectable progesterone
Most fixed-time artificial insemination (FTAI) protocols utilize progesterone (P4) as a hormonal source to achieve synchronization of estrus in cattle. The use of an injectable P4 source to control estrus would be an interesting pharmacological strategy owing to the practicality of parenteral applic...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Universidade Estadual de Londrina
2016-08-01
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| Series: | Semina: Ciências Agrárias |
| Subjects: | |
| Online Access: | http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/23947 |
| _version_ | 1828486675129434112 |
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| author | Jefferson Tadeu Campos Fábio Morotti Larissa Zamparone Bergamo Camila Bortoliero Costa Marcelo Marcondes Seneda |
| author_facet | Jefferson Tadeu Campos Fábio Morotti Larissa Zamparone Bergamo Camila Bortoliero Costa Marcelo Marcondes Seneda |
| author_sort | Jefferson Tadeu Campos |
| collection | DOAJ |
| description | Most fixed-time artificial insemination (FTAI) protocols utilize progesterone (P4) as a hormonal source to achieve synchronization of estrus in cattle. The use of an injectable P4 source to control estrus would be an interesting pharmacological strategy owing to the practicality of parenteral application. However, the effects of injectable P4 on estrus cycle control in cattle remain poorly studied. In particular, no existing studies have investigated the effect of injectable P4 on the fertility of cows subjected to FTAI. The aim of this study was to evaluate the pregnancy rate of lactating and non-lactating Nelore cows subjected to FTAI with injectable P4. Of the 422 non-lactating cows in this study, 162 (38.3%) became pregnant by 60 days post-FTAI. In the lactating group (n = 516), 166 (32.1%) were pregnant by 60 days after treatment with injectable P4. The proportions of lactating and non-lactating cows becoming pregnant were compared using the chi-square test, adopting a significance level of P < 0.05. It was found that the pregnancy rate of the cows subjected to FTAI with injectable P4 was influenced by lactation status. Lactating cows had lower reproductive performance, possibly because of their higher nutritional requirements. However, the use of injectable P4 shows promising results and may prove to be a useful strategy in large-scale livestock production. |
| first_indexed | 2024-12-11T09:37:18Z |
| format | Article |
| id | doaj.art-395b4d0eb2eb4cd09a46f023b7e1e929 |
| institution | Directory Open Access Journal |
| issn | 1676-546X 1679-0359 |
| language | English |
| last_indexed | 2024-12-11T09:37:18Z |
| publishDate | 2016-08-01 |
| publisher | Universidade Estadual de Londrina |
| record_format | Article |
| series | Semina: Ciências Agrárias |
| spelling | doaj.art-395b4d0eb2eb4cd09a46f023b7e1e9292022-12-22T01:12:49ZengUniversidade Estadual de LondrinaSemina: Ciências Agrárias1676-546X1679-03592016-08-013741991199610.5433/1679-0359.2016v37n4p199114280Pregnancy rate evaluation in lactating and non-lactating Nelore cows subjected to fixed-time artificial insemination using injectable progesteroneJefferson Tadeu Campos0Fábio Morotti1Larissa Zamparone Bergamo2Camila Bortoliero Costa3Marcelo Marcondes Seneda4Universidade Estadual de LondrinaUniversidade Estadual de LondrinaUniversidade Estadual de LondrinaUniversidade Estadual de LondrinaUniversidade Estadual de LondrinaMost fixed-time artificial insemination (FTAI) protocols utilize progesterone (P4) as a hormonal source to achieve synchronization of estrus in cattle. The use of an injectable P4 source to control estrus would be an interesting pharmacological strategy owing to the practicality of parenteral application. However, the effects of injectable P4 on estrus cycle control in cattle remain poorly studied. In particular, no existing studies have investigated the effect of injectable P4 on the fertility of cows subjected to FTAI. The aim of this study was to evaluate the pregnancy rate of lactating and non-lactating Nelore cows subjected to FTAI with injectable P4. Of the 422 non-lactating cows in this study, 162 (38.3%) became pregnant by 60 days post-FTAI. In the lactating group (n = 516), 166 (32.1%) were pregnant by 60 days after treatment with injectable P4. The proportions of lactating and non-lactating cows becoming pregnant were compared using the chi-square test, adopting a significance level of P < 0.05. It was found that the pregnancy rate of the cows subjected to FTAI with injectable P4 was influenced by lactation status. Lactating cows had lower reproductive performance, possibly because of their higher nutritional requirements. However, the use of injectable P4 shows promising results and may prove to be a useful strategy in large-scale livestock production.http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/23947Progesterona InjetávelVaca lactanteVaca não lactanteSincronização da ovulaçãoTaxa de prenhez. |
| spellingShingle | Jefferson Tadeu Campos Fábio Morotti Larissa Zamparone Bergamo Camila Bortoliero Costa Marcelo Marcondes Seneda Pregnancy rate evaluation in lactating and non-lactating Nelore cows subjected to fixed-time artificial insemination using injectable progesterone Semina: Ciências Agrárias Progesterona Injetável Vaca lactante Vaca não lactante Sincronização da ovulação Taxa de prenhez. |
| title | Pregnancy rate evaluation in lactating and non-lactating Nelore cows subjected to fixed-time artificial insemination using injectable progesterone |
| title_full | Pregnancy rate evaluation in lactating and non-lactating Nelore cows subjected to fixed-time artificial insemination using injectable progesterone |
| title_fullStr | Pregnancy rate evaluation in lactating and non-lactating Nelore cows subjected to fixed-time artificial insemination using injectable progesterone |
| title_full_unstemmed | Pregnancy rate evaluation in lactating and non-lactating Nelore cows subjected to fixed-time artificial insemination using injectable progesterone |
| title_short | Pregnancy rate evaluation in lactating and non-lactating Nelore cows subjected to fixed-time artificial insemination using injectable progesterone |
| title_sort | pregnancy rate evaluation in lactating and non lactating nelore cows subjected to fixed time artificial insemination using injectable progesterone |
| topic | Progesterona Injetável Vaca lactante Vaca não lactante Sincronização da ovulação Taxa de prenhez. |
| url | http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/23947 |
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