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Browsing by Subject "Dairy cows"

Now showing 1 - 6 of 6
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    Association between daily cow data and milk production in dairy herds milked with automatic milking systems
    (2021-04) Peiter, Mateus
    Automatic milking systems (AMS) for dairy cows and its associated technologies can continuously monitor individual production, behavior, and physiological parameters, allowing for real-time decision making on these farms. Furthermore, the data recorded automatically in these systems allow dairy advisors to extrapolate some of the findings to cows milked with systems other than AMS. The main objective of this dissertation was to investigate cow daily behavior associated with milk production on AMS farms. Data from 47 AMS dairy farms located in Minnesota and Wisconsin in the U.S. were collected for a period of 12 months. RStudio was used for all the data management and statistical analyses. Multiparous cows with greater average rumination time and greater rumination time increase in the immediate postpartum period produced more milk at lactation peak, while the same association was absent for primiparous cows. Various behavior variables recorded during the time cows are in the AMS to be milked were associated with daily milk production, such as average daily milking interval, concentrate intake, number of failures, milking speed and time, and pre- and post-treatment time. Moreover, a quadratic relationship was found between body weight change in early lactation and 90-d milk yield, where cows with the ability to maintain or lose less than 10% of their body weight from DIM 1 presented greater total milk production over the first 90 DIM. Findings reported in this dissertation may be used to make milk production predictions and serve as benchmark data for AMS producers in the U.S.
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    Dairy Herd Planning Guide : Should I Produce Milk. (revised 12/73)
    (University of Minnesota, Agricultural Extension Service, 1973-12) University of Minnesota, Agricultural Extension Service; Fuller, Earl I.; Thomas, Kenneth H.; Freeman, Mervin L.; Appleman, Robert D.; Conlin, Bernard J.
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    Proceedings, 25th annual Minnesota Nutrition Conference 1964,
    (University of Minnesota, 1964-09)
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    Using Direct Fed Microbials And Exogenous Fibrolytic Enzymes To Enhance Fiber Digestibility Of Dairy Cow Diets
    (2015-06) Da Silva, Dayane
    Exogenous fibrolytic enzyme and DFMs additives are emerging technologies that show promise in terms of increasing diet formulation flexibility. They may improve fiber digestibility making possible greater inclusions of forages in the ration without negatively impacting animal performance.The objectives of this dissertation were to investigate the effect of Bacillus pumilus 8G-134 (BP) supplementation on total tract nutrient digestibility and milk yield of postpartum dairy cows fed low (20%, LS) or high (27%, HS) starch diets. Moreover, to examine the effect of adding a fibrolytic enzyme preparation through a molasses-based liquid feed (MLF) to diets on digestibility, ruminal patterns and production performance of primiparous cows. We hypothesized that BP, a spore forming Gram-positive bacteria, would increase production of ruminal xylanase and increase fiber digestion, dry matter intake (DMI), and performance of cows fed LS and HS diets postpartum. In addition, fibrolytic enzymes would increase fiber digestibility, efficiency of nutrient use of pre- and postpartum diets and assure greater performance compared to control diets.Results indicated that BP supplementation during early lactation decreased body lipid mobilization; therefore further research is needed to investigate the use of BP as a feeding strategy during the early postpartum period. During the 112 d of BP supplementation, DMI and milk fat yield increased, and milk protein yield tended to increase for both LS and HS diets fed to primiparous dairy cows. Moreover, BP tended to improve 3.5% FCM yield by 4.3% and 8.9% for LS and HS, respectively. Results also indicated that BP supplementation to primiparous cows can increase fiber digestibility and milk yield resulting in potential increases in profitability. Biological cows' response when fed enzyme supplementation was small, although positive. Future research is required to elucidate how different doses and length of feeding enzymes may affect growth and performance of animals in first lactation.