Particle size distribution consistency in mixed rations on UK commercial dairy farms

Brian Evans, Charlotte Pearson

    Research output: Contribution to conferencePoster

    Abstract

    Total mixed rations (TMR) and partial mixed rations (PMR) are now commonplace on UK dairy farms due to ever-increasing herd size and lactation yields. Rations should meet the cow’s nutritional requirements although research has shown differences exist between the formulated and the delivered ration because of on farm mixing. This inconsistency, including particle size is a key factor in the effective fibre aspect of the ration, has a negative effect on the performance and health of the cow. There is very little research on the initial particle size variation in mixed rations and the reasons for such variation. Therefore, the aim of this study was to investigate the extent of particle distribution variation in the initial dispensed ration to dairy cows and the possible causes for this.

    Sampling took place over five farms that fed either TMR or PMR, for a selection of different lactation groups. Ten samples were taken equidistance along the feed face of each of the loads and a Penn State Particle Separator used to determine particle size distribution. Coefficient of variation (CV%) was calculated for each mixed ration load based on a three-day average. SPSS was used for data analysis. Correlation relationships between CV% and influencing factors were examined. Results showed there was no significant correlation with either dry matter%, forage%, forage NDF% or wagon fill (fresh weight). Comparison between horizontal and vertical mixer wagon type was made using a t-test. This revealed a significant difference (P=0.004), where the vertical wagon type had a lesser CV% (6.8%) compared to the horizontal mixer type (13.5%). Particle distribution inconsistency of the initial feed-out was noted to be far higher than North America values. This suggests either more can be done to improve the consistency of mixed rations on UK dairy farms or the recommendations advised need to be further refined for Penn State Particle Separator use in the UK; given the higher proportion of grass silage included within UK rations. Dairy farmers need to consider mixer wagon choice and implement a monitoring system that is suited for UK forage production type to minimise initial spatial variation. This in turn will reduce the risk of poor rumen health and promote improvements in production
    Original languageEnglish
    Publication statusPublished - 1 Jul 2019
    EventHartpury Research Conference 2019 - Hartpury University, Gloucester, United Kingdom
    Duration: 1 Jul 20191 Jul 2019

    Conference

    ConferenceHartpury Research Conference 2019
    CountryUnited Kingdom
    CityGloucester
    Period1/7/191/7/19

    Fingerprint

    wagons
    particle size distribution
    dairy farming
    mixers
    separators
    total mixed rations
    particle size
    lactation
    forage
    cows
    farms
    forage production
    herd size
    grass silage
    nutrient requirements
    spatial variation
    rumen
    dairies
    data analysis
    dairy cows

    Cite this

    Evans, B., & Pearson, C. (2019). Particle size distribution consistency in mixed rations on UK commercial dairy farms. Poster session presented at Hartpury Research Conference 2019, Gloucester, United Kingdom.
    Evans, Brian ; Pearson, Charlotte. / Particle size distribution consistency in mixed rations on UK commercial dairy farms. Poster session presented at Hartpury Research Conference 2019, Gloucester, United Kingdom.
    @conference{58eac65c8df7448cb6edd84f81cd037b,
    title = "Particle size distribution consistency in mixed rations on UK commercial dairy farms",
    abstract = "Total mixed rations (TMR) and partial mixed rations (PMR) are now commonplace on UK dairy farms due to ever-increasing herd size and lactation yields. Rations should meet the cow’s nutritional requirements although research has shown differences exist between the formulated and the delivered ration because of on farm mixing. This inconsistency, including particle size is a key factor in the effective fibre aspect of the ration, has a negative effect on the performance and health of the cow. There is very little research on the initial particle size variation in mixed rations and the reasons for such variation. Therefore, the aim of this study was to investigate the extent of particle distribution variation in the initial dispensed ration to dairy cows and the possible causes for this.Sampling took place over five farms that fed either TMR or PMR, for a selection of different lactation groups. Ten samples were taken equidistance along the feed face of each of the loads and a Penn State Particle Separator used to determine particle size distribution. Coefficient of variation (CV{\%}) was calculated for each mixed ration load based on a three-day average. SPSS was used for data analysis. Correlation relationships between CV{\%} and influencing factors were examined. Results showed there was no significant correlation with either dry matter{\%}, forage{\%}, forage NDF{\%} or wagon fill (fresh weight). Comparison between horizontal and vertical mixer wagon type was made using a t-test. This revealed a significant difference (P=0.004), where the vertical wagon type had a lesser CV{\%} (6.8{\%}) compared to the horizontal mixer type (13.5{\%}). Particle distribution inconsistency of the initial feed-out was noted to be far higher than North America values. This suggests either more can be done to improve the consistency of mixed rations on UK dairy farms or the recommendations advised need to be further refined for Penn State Particle Separator use in the UK; given the higher proportion of grass silage included within UK rations. Dairy farmers need to consider mixer wagon choice and implement a monitoring system that is suited for UK forage production type to minimise initial spatial variation. This in turn will reduce the risk of poor rumen health and promote improvements in production",
    author = "Brian Evans and Charlotte Pearson",
    year = "2019",
    month = "7",
    day = "1",
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    note = "Hartpury Research Conference 2019 ; Conference date: 01-07-2019 Through 01-07-2019",

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    Evans, B & Pearson, C 2019, 'Particle size distribution consistency in mixed rations on UK commercial dairy farms' Hartpury Research Conference 2019, Gloucester, United Kingdom, 1/7/19 - 1/7/19, .

    Particle size distribution consistency in mixed rations on UK commercial dairy farms. / Evans, Brian; Pearson, Charlotte.

    2019. Poster session presented at Hartpury Research Conference 2019, Gloucester, United Kingdom.

    Research output: Contribution to conferencePoster

    TY - CONF

    T1 - Particle size distribution consistency in mixed rations on UK commercial dairy farms

    AU - Evans, Brian

    AU - Pearson, Charlotte

    PY - 2019/7/1

    Y1 - 2019/7/1

    N2 - Total mixed rations (TMR) and partial mixed rations (PMR) are now commonplace on UK dairy farms due to ever-increasing herd size and lactation yields. Rations should meet the cow’s nutritional requirements although research has shown differences exist between the formulated and the delivered ration because of on farm mixing. This inconsistency, including particle size is a key factor in the effective fibre aspect of the ration, has a negative effect on the performance and health of the cow. There is very little research on the initial particle size variation in mixed rations and the reasons for such variation. Therefore, the aim of this study was to investigate the extent of particle distribution variation in the initial dispensed ration to dairy cows and the possible causes for this.Sampling took place over five farms that fed either TMR or PMR, for a selection of different lactation groups. Ten samples were taken equidistance along the feed face of each of the loads and a Penn State Particle Separator used to determine particle size distribution. Coefficient of variation (CV%) was calculated for each mixed ration load based on a three-day average. SPSS was used for data analysis. Correlation relationships between CV% and influencing factors were examined. Results showed there was no significant correlation with either dry matter%, forage%, forage NDF% or wagon fill (fresh weight). Comparison between horizontal and vertical mixer wagon type was made using a t-test. This revealed a significant difference (P=0.004), where the vertical wagon type had a lesser CV% (6.8%) compared to the horizontal mixer type (13.5%). Particle distribution inconsistency of the initial feed-out was noted to be far higher than North America values. This suggests either more can be done to improve the consistency of mixed rations on UK dairy farms or the recommendations advised need to be further refined for Penn State Particle Separator use in the UK; given the higher proportion of grass silage included within UK rations. Dairy farmers need to consider mixer wagon choice and implement a monitoring system that is suited for UK forage production type to minimise initial spatial variation. This in turn will reduce the risk of poor rumen health and promote improvements in production

    AB - Total mixed rations (TMR) and partial mixed rations (PMR) are now commonplace on UK dairy farms due to ever-increasing herd size and lactation yields. Rations should meet the cow’s nutritional requirements although research has shown differences exist between the formulated and the delivered ration because of on farm mixing. This inconsistency, including particle size is a key factor in the effective fibre aspect of the ration, has a negative effect on the performance and health of the cow. There is very little research on the initial particle size variation in mixed rations and the reasons for such variation. Therefore, the aim of this study was to investigate the extent of particle distribution variation in the initial dispensed ration to dairy cows and the possible causes for this.Sampling took place over five farms that fed either TMR or PMR, for a selection of different lactation groups. Ten samples were taken equidistance along the feed face of each of the loads and a Penn State Particle Separator used to determine particle size distribution. Coefficient of variation (CV%) was calculated for each mixed ration load based on a three-day average. SPSS was used for data analysis. Correlation relationships between CV% and influencing factors were examined. Results showed there was no significant correlation with either dry matter%, forage%, forage NDF% or wagon fill (fresh weight). Comparison between horizontal and vertical mixer wagon type was made using a t-test. This revealed a significant difference (P=0.004), where the vertical wagon type had a lesser CV% (6.8%) compared to the horizontal mixer type (13.5%). Particle distribution inconsistency of the initial feed-out was noted to be far higher than North America values. This suggests either more can be done to improve the consistency of mixed rations on UK dairy farms or the recommendations advised need to be further refined for Penn State Particle Separator use in the UK; given the higher proportion of grass silage included within UK rations. Dairy farmers need to consider mixer wagon choice and implement a monitoring system that is suited for UK forage production type to minimise initial spatial variation. This in turn will reduce the risk of poor rumen health and promote improvements in production

    M3 - Poster

    ER -

    Evans B, Pearson C. Particle size distribution consistency in mixed rations on UK commercial dairy farms. 2019. Poster session presented at Hartpury Research Conference 2019, Gloucester, United Kingdom.