Production response in dairy cows milked two or three times a day: A meta-analysis
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| Format: | Artículo científico |
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Universidad Nacional Autónoma de México
2020
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| author | Juan I. Sánchez-Duarte |
| author_facet | Juan I. Sánchez-Duarte |
| contents | Production response in dairy cows milked two or three times a day: A meta-analysis Juan I. Sánchez-Duarte Álvaro García Karla Rodríguez-Hernández David G. Reta-Sánchez Homero Salinas-González Esmeralda Ochoa-Martínez Arturo Reyes-González Multidisciplinaria (Ciencias Naturales y Exactas) Milk yield Effect size Heterogeneity Milk composition Milking frequency The objective was to evaluate the effects of two (2x) vs three (3x) times per day milking on milk production and milk composition in dairy cows. Fourteen scientific papers, containing production data from 16 trials, where dairy cows were milked 2x or 3x, were analysed using meta-analysis with fixed and random-effects with the R statistical program. The degree of heterogeneity and publication bias were measured with the I2 statistic and Begg's test, respectively. In addition, the meta-regression analysis explored other sources of heterogeneity for the response. The estimated effect size of 2x and 3x milkings was calculated for dry matter intake (DMI), milk production, and milk composition. Dry matter intake, milk production, and milk fat and protein yields showed substantial heterogeneity (I2>50%). Whereas milk fat-percentage had moderate heterogeneity (I2<50%), and milk protein had no (I2=0%) heterogeneity. The year of publication, trial duration, and cattle breed did not influence production response parameters to milking frequency. We found no evidence of publication bias for the parameters evaluated (Begg's test; P>.05). Cows milked 2x produced less milk (2.23 kg/d), less milk fat (0.06 kg/d), and less milk protein (0.05 kg/d). In contrast, the fat percentage was lower (0.07 units) in 3x, compared with 2x milking frequency. There was no effect of milking frequency on DMI and milk protein percentage. In conclusion, milk production and milk fat and protein yields improves as milking frequency increase from 2x to 3x daily, without affecting DMI. The implementation of 3x milking frequency must consider dairy cow management, labor, and milking parlour infrastructure, particular to each dairy farm. 2020 artículo científico 0301-5092 https://www.redalyc.org/articulo.oa?id=42371734003 https://www.redalyc.org/journal/423/42371734003/ https://www.redalyc.org/journal/423/42371734003/html/ https://www.redalyc.org/journal/423/42371734003/42371734003.epub https://www.redalyc.org/journal/423/42371734003/movil 10.22201/fmvz.24486760e.2020.2.562 en http://www.redalyc.org/revista.oa?id=423 Veterinaria México application/pdf Universidad Nacional Autónoma de México Veterinaria México (México) Num.2 Vol.7 |
| format | Artículo científico |
| id | redalyc_42371734003 |
| institution | Redalyc |
| language | en |
| publishDate | 2020 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Production response in dairy cows milked two or three times a day: A meta-analysis Juan I. Sánchez-Duarte Multidisciplinaria (Ciencias Naturales y Exactas) Milk yield Effect size Heterogeneity Milk composition Milking frequency Production response in dairy cows milked two or three times a day: A meta-analysis Juan I. Sánchez-Duarte Álvaro García Karla Rodríguez-Hernández David G. Reta-Sánchez Homero Salinas-González Esmeralda Ochoa-Martínez Arturo Reyes-González Multidisciplinaria (Ciencias Naturales y Exactas) Milk yield Effect size Heterogeneity Milk composition Milking frequency The objective was to evaluate the effects of two (2x) vs three (3x) times per day milking on milk production and milk composition in dairy cows. Fourteen scientific papers, containing production data from 16 trials, where dairy cows were milked 2x or 3x, were analysed using meta-analysis with fixed and random-effects with the R statistical program. The degree of heterogeneity and publication bias were measured with the I2 statistic and Begg's test, respectively. In addition, the meta-regression analysis explored other sources of heterogeneity for the response. The estimated effect size of 2x and 3x milkings was calculated for dry matter intake (DMI), milk production, and milk composition. Dry matter intake, milk production, and milk fat and protein yields showed substantial heterogeneity (I2>50%). Whereas milk fat-percentage had moderate heterogeneity (I2<50%), and milk protein had no (I2=0%) heterogeneity. The year of publication, trial duration, and cattle breed did not influence production response parameters to milking frequency. We found no evidence of publication bias for the parameters evaluated (Begg's test; P>.05). Cows milked 2x produced less milk (2.23 kg/d), less milk fat (0.06 kg/d), and less milk protein (0.05 kg/d). In contrast, the fat percentage was lower (0.07 units) in 3x, compared with 2x milking frequency. There was no effect of milking frequency on DMI and milk protein percentage. In conclusion, milk production and milk fat and protein yields improves as milking frequency increase from 2x to 3x daily, without affecting DMI. The implementation of 3x milking frequency must consider dairy cow management, labor, and milking parlour infrastructure, particular to each dairy farm. 2020 artículo científico 0301-5092 https://www.redalyc.org/articulo.oa?id=42371734003 https://www.redalyc.org/journal/423/42371734003/ https://www.redalyc.org/journal/423/42371734003/html/ https://www.redalyc.org/journal/423/42371734003/42371734003.epub https://www.redalyc.org/journal/423/42371734003/movil 10.22201/fmvz.24486760e.2020.2.562 en http://www.redalyc.org/revista.oa?id=423 Veterinaria México application/pdf Universidad Nacional Autónoma de México Veterinaria México (México) Num.2 Vol.7 |
| title | Production response in dairy cows milked two or three times a day: A meta-analysis |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) Milk yield Effect size Heterogeneity Milk composition Milking frequency |
| url | https://www.redalyc.org/articulo.oa?id=42371734003 https://www.redalyc.org/journal/423/42371734003/ https://www.redalyc.org/journal/423/42371734003/html/ https://www.redalyc.org/journal/423/42371734003/42371734003.epub https://www.redalyc.org/journal/423/42371734003/movil |