Scope for a Subjective Assessment of Milking Speed
نویسنده
چکیده
Farmers' subjective evaluations of their cows' milking speed, scored as "very fast", "fast", "average", "slow", or "very slow", were recorded between 1982 and 1985 under Agriculture Canada's Record of Performance milk recording scheme. For the analysis, scores taken at the beginning (score 1) and the end (score 2) of the lactation were distinguished. Edited data comprised 20,909 records for score 1 and 19,012 records for score 2 for Ayrshires and 190,455 and 148,536 for Holsteins. Data were analyzed in eight subsets. The effects of herd-year-seasons (of calving), calving age, and stage of lactation when scored were evaluated and variance and covariance component estimates were obtained for sires, cows, and residuals. Heritabilities were .21 and .14 for score 1 for Holsteins and Ayrshires, respectively, and .17 and .16 for score 2. Repeatabilities were .42 and .37 for the two breeds. The scope of a sire evaluation for milking speed based on subjective scores is discussed.
منابع مشابه
Short communication: Genetic evaluation of milking speed for Brown Swiss dairy cattle in the United States.
Genetic parameters and relative breeding values were estimated for milking speed of US Brown Swiss dairy cattle. Owner-recorded milking-speed scores on a scale of 1 (slow) to 8 (fast) were collected by the Brown Swiss Association as part of its linear type appraisal program starting in 2004. Data were 7,366 records for 6,666 cows in 393 herds. The pedigree file included information for 21,458 a...
متن کاملChanges in milking parameters with robotic milking
The aim of this present study is to describe changes occurring during the milking of cows in various periods following the introduction of an AMS (automatic milking system). The following cow milking parameters were analysed: milkings per cow per day, milking yield, milking speed and milking duration. An increase in milk yield in AMS barns has been found to be possible, but it is affected by a ...
متن کاملارزیابی ارگونومیکی روشهای شیردوشی سنتی و مکانیزه در دامداریهای گاو شیری
Introduction: Despite the introduction and development of agricultural mechanization in the dairy farm sector of Iran, many tasks are still performed by manual labor in the country’ dairy farms, including milking, and necessitate poor body postures and movements that help increase the risk of musculoskeletal disorders among hand milking workers. Material and Methods: The present study was co...
متن کاملComparative determination of physical stress and strain on milkers in milking parlours on dairy farms in Upper Austria, using ECG, an activity sensor and spirometer
To-date, the impact of modern milking parlors in dairy farming on physical strain has not been the subject of many studies. Therefore, this case study aims to record and evaluate the physical strain during the entire milking process, including the oxygen consumption (VO2), heart rate (HR) and metabolic rate (WkJ, Watt) of milkers. The recording was conducted with a portable respiratory gas anal...
متن کامل