development of a weight-estimation model to use in pregnant criollo-type mares
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ID: 205975
2017
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Abstract
ABSTRACT: The aims of this study were: 1) to compare the tape weight and associated weight-estimation formula to evaluate weight gain in pregnant mares, and 2) to develop a mathematical model to estimate the weight of pregnant mares using body measurements. Thirty-four criollo-type mares were evaluated every two weeks during the middle and late pregnancy. The mares were weighed on a livestock scale, and we estimated body weight using tape weights and an associated body-weight estimation formula. Also, heart-girth circumference (heartgirth) and abdominal circumference were measured; the latter at the 12th intercostal space (12th ICS) and 18th rib (18th Rib), to use in a mathematical model to estimate the weight of pregnant mares. Observations were divided into three periods of pregnancy: 5th to 7 h month, 7th to 9 h month, and 9th to 11th month. Mares in late pregnancy showed an increase in actual weight and an increase in 12th ICS and 18th Rib measurements. Tape weight and body-weight estimation formula underestimated the weight of pregnant mares. However, the regression model using heart-girth circumference, 12th ICS, and 18th Rib measurements showed high correlation (r2 = 0.87, P<0.001) with actual weight. Finally, the alternative methods usually used in horses are not accurate to estimate body weight in pregnant mares. In conclusion, the regression model Y=-540.143 + (heartgirth x 3.068) + (12th ICS x 1.278) + (18th Rib x 0.944) can be used to estimate body weight in pregnant mares from the 5th to 11th months of pregnancy.
| Reference Key |
vieira2017cinciadevelopment
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|---|---|
| Authors | ;Patricia Soares Vieira;Carlos Eduardo Wayne Nogueira;Alice Correa Santos;Luciana de Araujo Borba;Rebeca Scalco;Carolina Litchina Brasil;Willian Silva Barros;Bruna da Rosa Curcio |
| Journal | Trials |
| Year | 2017 |
| DOI |
10.1590/0103-8478cr20160590
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| URL | |
| Keywords | Keywords not found |
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