Production response in dairy cows milked two or three times a day: A meta-analysis.
The objective was to evaluate the effects of two (2×) vs three (3×) 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 2× or 3×, were analysed using meta-analysis with fixed...
| Publicado en: | Veterinaria México OA Vol. 7; no. 2; pp. 1 - 18 |
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| Autores principales: | , , , , , , |
| Formato: | Artículo |
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Facultad de Medicina Veterinaria y Zootecnia UNAM
Apr-Jun2020
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=lth&AN=144662666&site=ehost-live header: @attributes: shortDbName: lth uiTerm: 144662666 longDbName: MedicLatina uiTag: AN controlInfo: bkinfo: jinfo: jid: 24486760 NFHU jtl: Veterinaria México OA issn: 24486760 maglogo: N pubinfo: dt: Apr-Jun2020 vid: 7 iid: 2 pid: 20869 pub: Facultad de Medicina Veterinaria y Zootecnia UNAM artinfo: ui: 144662666 10.22201/fmvz.24486760e.2020.2.562 ppf: 1 ppct: 17 formats: fmt: @attributes: type: P size: 1.3MB tig: atl: Production response in dairy cows milked two or three times a day: A meta-analysis. aug: au: Sánchez-Duarte, Juan I. García, Álvaro Rodríguez-Hernández, Karla Reta-Sánchez, David G. Salinas-González, Homero Ochoa-Martínez, Esmeralda Reyes-González, Arturo affil: Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias, Matamoros, Coahuila, México Dairy and Food Science Department, South Dakota State University, Brookings, SD, USA su: Dairy cattle Milking Milk proteins Milk yield Composition of milk Milk Milkfat sug: subj: Dairy cattle Milking Milk proteins Milk yield Composition of milk Milk Milkfat keyword: Effect size Heterogeneity Milk composition Milking frequency ab: The objective was to evaluate the effects of two (2×) vs three (3×) 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 2× or 3×, 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 2× and 3× 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 2× 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 3×, compared with 2× 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 2× to 3× daily, without affecting DMI. The implementation of 3× milking frequency must consider dairy cow management, labor, and milking parlour infrastructure, particular to each dairy farm. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y custom: Copyright of Veterinaria México OA is the property of Facultad de Medicina Veterinaria y Zootecnia UNAM and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. item: Veterinaria México OA holder: Facultad de Medicina Veterinaria y Zootecnia UNAM dt: @attributes: year: 2020 holdings: @attributes: islocal: N |
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