Reproductive performance of heifers of different weight classes in the first and second mating
The objective of this study was to evaluate the effect of live weight at first mating on reproductive performance in the first and second reproductive years. For that purpose, the reproductive history of 221 heifers mated for the first time between the years of 2003 and 2012 was evaluated. Heifers w...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Universidade Estadual de Londrina
2019-04-01
|
| Series: | Semina: Ciências Agrárias |
| Subjects: | |
| Online Access: | http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/33328 |
| _version_ | 1817978396015067136 |
|---|---|
| author | Rangel Fernandes Pacheco Ivan Luiz Brondani Dari Celestino Alves Filho Jonatas Cattelam Andrei Retamoso Mayer Ana Paula Machado Martini Gilmar Cardoso dos Santos Daniele Borchate João Restle |
| author_facet | Rangel Fernandes Pacheco Ivan Luiz Brondani Dari Celestino Alves Filho Jonatas Cattelam Andrei Retamoso Mayer Ana Paula Machado Martini Gilmar Cardoso dos Santos Daniele Borchate João Restle |
| author_sort | Rangel Fernandes Pacheco |
| collection | DOAJ |
| description | The objective of this study was to evaluate the effect of live weight at first mating on reproductive performance in the first and second reproductive years. For that purpose, the reproductive history of 221 heifers mated for the first time between the years of 2003 and 2012 was evaluated. Heifers were grouped into three weight classes at the age of 24 months: 50-59.9% (55%), 60-69.9% (65%), and 70-80% (75%). The pregnancy rate in the first reproductive year in heifers from weight classes 55%, 65%, and 75% was 38.0%, 56.4%, and 69.0%, respectively. The pregnancy rate in the second reproductive year was not affected by weight at first mating (p > 0.05) and corresponded to 41.6%; 42.1%, and 50.4% in the three weight classes, respectively. The weight class of heifers before mating at the age of 24 months affected reproductive performance at first mating but did not increase the pregnancy rate in the second reproductive year. |
| first_indexed | 2024-04-13T22:28:28Z |
| format | Article |
| id | doaj.art-589f096bed1646aca3c4152f3dfdc2c9 |
| institution | Directory Open Access Journal |
| issn | 1676-546X 1679-0359 |
| language | English |
| last_indexed | 2024-04-13T22:28:28Z |
| publishDate | 2019-04-01 |
| publisher | Universidade Estadual de Londrina |
| record_format | Article |
| series | Semina: Ciências Agrárias |
| spelling | doaj.art-589f096bed1646aca3c4152f3dfdc2c92022-12-22T02:26:59ZengUniversidade Estadual de LondrinaSemina: Ciências Agrárias1676-546X1679-03592019-04-0140281983010.5433/1679-0359.2019v40n2p81918424Reproductive performance of heifers of different weight classes in the first and second matingRangel Fernandes Pacheco0Ivan Luiz Brondani1Dari Celestino Alves Filho2Jonatas Cattelam3Andrei Retamoso Mayer4Ana Paula Machado Martini5Gilmar Cardoso dos Santos6Daniele Borchate7João Restle8Instituto Federal de Santa CatarinaUniversidade Federal de Santa MariaUniversidade Federal de Santa MariaUniversidade Federal da Fronteira SulInstituto de Desenvolvimento Institucional do Alto UruguaiUniversidade Federal de Santa MariaUniversidade Federal de Santa MariaUniversidade Federal de Santa MariaUniversidade Federal de GoiásThe objective of this study was to evaluate the effect of live weight at first mating on reproductive performance in the first and second reproductive years. For that purpose, the reproductive history of 221 heifers mated for the first time between the years of 2003 and 2012 was evaluated. Heifers were grouped into three weight classes at the age of 24 months: 50-59.9% (55%), 60-69.9% (65%), and 70-80% (75%). The pregnancy rate in the first reproductive year in heifers from weight classes 55%, 65%, and 75% was 38.0%, 56.4%, and 69.0%, respectively. The pregnancy rate in the second reproductive year was not affected by weight at first mating (p > 0.05) and corresponded to 41.6%; 42.1%, and 50.4% in the three weight classes, respectively. The weight class of heifers before mating at the age of 24 months affected reproductive performance at first mating but did not increase the pregnancy rate in the second reproductive year.http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/33328Heifer developmentDesired body weightFirst matingFirst calving. |
| spellingShingle | Rangel Fernandes Pacheco Ivan Luiz Brondani Dari Celestino Alves Filho Jonatas Cattelam Andrei Retamoso Mayer Ana Paula Machado Martini Gilmar Cardoso dos Santos Daniele Borchate João Restle Reproductive performance of heifers of different weight classes in the first and second mating Semina: Ciências Agrárias Heifer development Desired body weight First mating First calving. |
| title | Reproductive performance of heifers of different weight classes in the first and second mating |
| title_full | Reproductive performance of heifers of different weight classes in the first and second mating |
| title_fullStr | Reproductive performance of heifers of different weight classes in the first and second mating |
| title_full_unstemmed | Reproductive performance of heifers of different weight classes in the first and second mating |
| title_short | Reproductive performance of heifers of different weight classes in the first and second mating |
| title_sort | reproductive performance of heifers of different weight classes in the first and second mating |
| topic | Heifer development Desired body weight First mating First calving. |
| url | http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/33328 |
| work_keys_str_mv | AT rangelfernandespacheco reproductiveperformanceofheifersofdifferentweightclassesinthefirstandsecondmating AT ivanluizbrondani reproductiveperformanceofheifersofdifferentweightclassesinthefirstandsecondmating AT daricelestinoalvesfilho reproductiveperformanceofheifersofdifferentweightclassesinthefirstandsecondmating AT jonatascattelam reproductiveperformanceofheifersofdifferentweightclassesinthefirstandsecondmating AT andreiretamosomayer reproductiveperformanceofheifersofdifferentweightclassesinthefirstandsecondmating AT anapaulamachadomartini reproductiveperformanceofheifersofdifferentweightclassesinthefirstandsecondmating AT gilmarcardosodossantos reproductiveperformanceofheifersofdifferentweightclassesinthefirstandsecondmating AT danieleborchate reproductiveperformanceofheifersofdifferentweightclassesinthefirstandsecondmating AT joaorestle reproductiveperformanceofheifersofdifferentweightclassesinthefirstandsecondmating |