EFFECT OF FEEDING FREQUENCY ON DIGESTIBILITY, MILK PRODUCTION AND COMPOSITION IN LACTATING COWS: A META-ANALYSIS AND META-REGRESSION

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MIRZAEI ALAMOUTI HAMIDREZA; KAZEMI JOUJILI MEHDI; AMANLOU HAMID; VAZIRIGOHAR MINA

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Journal: Iranian Journal of Animal Science Year:2015 | Volume:46 | Issue:3 Page(s): 301-314

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Title

EFFECT OF FEEDING FREQUENCY ON DIGESTIBILITY, MILK PRODUCTION AND COMPOSITION IN LACTATING COWS: A META-ANALYSIS AND META-REGRESSION

Author(s)

MIRZAEI ALAMOUTI HAMIDREZA | KAZEMI JOUJILI MEHDI | AMANLOU HAMID | VAZIRIGOHAR MINA | Issue Writer Certificate

Keywords

FEEDING FREQUENCYQ2

LACTATING COWQ2

META-ANALYSISQ2

Abstract

The objective of this study was to evaluate the effect of frequency of feeding total mixed ration (TMR) on total-tract digestibility, milk production and composition in LACTATING COWs, using META-ANALYSIS and meta-regression approaches. Data of fourteen experiments having containing 25 comparisons between treatment (higher FEEDING FREQUENCY) and control (lower FEEDING FREQUENCY) groups, defined selection criteria, were used. Data were analyzed using effect size method in STATA/SE. Increasing frequency of feeding decreased dry matter intake (DMI; weighted mean difference (WMD)= ‒0.134 kg/d) but had no effect on milk yield. Forage level of diet and days in milk (DIM) were the source of heterogeneity for standardized mean difference (SMD) of DMI. In this META-ANALYSIS, higher FEEDING FREQUENCY had no effect on milk fat and milk protein content and yield. Increasing FEEDING FREQUENCY improved NDF digestibility (WMD= 5.663%). Results of univariate meta-regression showed that increasing frequency of feeding in diets containing high level of grains improved NDF digestibility, but in high forage diets lowered NDF digestion. In conclusion, delivery of TMR containing equal amounts of forage and concentrate three times vs. one times in a day decreased DMI but did not change milk yield.

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APA: Copy

MIRZAEI ALAMOUTI, HAMIDREZA, KAZEMI JOUJILI, MEHDI, AMANLOU, HAMID, & VAZIRIGOHAR, MINA. (2015). EFFECT OF FEEDING FREQUENCY ON DIGESTIBILITY, MILK PRODUCTION AND COMPOSITION IN LACTATING COWS: A META-ANALYSIS AND META-REGRESSION. IRANIAN JOURNAL OF ANIMAL SCIENCE (IRANIAN JOURNAL OF AGRICULTURAL SCIENCES), 46(3), 301-314. SID. https://sid.ir/paper/193676/en

Vancouver: Copy

MIRZAEI ALAMOUTI HAMIDREZA, KAZEMI JOUJILI MEHDI, AMANLOU HAMID, VAZIRIGOHAR MINA. EFFECT OF FEEDING FREQUENCY ON DIGESTIBILITY, MILK PRODUCTION AND COMPOSITION IN LACTATING COWS: A META-ANALYSIS AND META-REGRESSION. IRANIAN JOURNAL OF ANIMAL SCIENCE (IRANIAN JOURNAL OF AGRICULTURAL SCIENCES)[Internet]. 2015;46(3):301-314. Available from: https://sid.ir/paper/193676/en

IEEE: Copy

HAMIDREZA MIRZAEI ALAMOUTI, MEHDI KAZEMI JOUJILI, HAMID AMANLOU, and MINA VAZIRIGOHAR, “EFFECT OF FEEDING FREQUENCY ON DIGESTIBILITY, MILK PRODUCTION AND COMPOSITION IN LACTATING COWS: A META-ANALYSIS AND META-REGRESSION,” IRANIAN JOURNAL OF ANIMAL SCIENCE (IRANIAN JOURNAL OF AGRICULTURAL SCIENCES), vol. 46, no. 3, pp. 301–314, 2015, [Online]. Available: https://sid.ir/paper/193676/en

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