in order to examine the effect of using rumen protected methionine (mepron, evonik industries, hanau, germany) on productive and reproductive performance under field condition, 195 holstein cows were used in a unbalanced completely randomized design and 2 groups. experimental treatments consisted of: 1) control group with 110 holstein dairy cows (71±51 dim and 47.5±12 milk yield) and without me...

Johne's disease ('paratuberculosis') is a chronic, infectious, wasting disease that affects dairy cattle. Estimation of its impact on herd productivity and corresponding economic loss on US dairy operations was part of the USDA National Animal Health Monitoring System's (NAHMS) 1996 national dairy study. Johne's-positive herds experience an economic loss of almost US$ 100 per cow when compared ...

Here we report dairy calf management practices used by 242 smallholder family farmers in the South of Brazil. Data were collected via a semi-structured questionnaire with farmers, inspection of the production environment and an in-depth interview with a sample of 26 farmers. Herds had an average of 22.3 lactating cows and an average milk production of 12.7 L/cow/day. Calves were dehorned in 98%...

The article substantiates the strategy of innovative development animal husbandry in Bryansk region. main indicators are studied. dynamics population animals, poultry, rabbits and bee colonies is analyzed. structure livestock products manufacturing, including production cattle poultry carcass weight, milk, eggs honey, calculated. productivity animals estimated, average daily weight gain pigs, a...

The data sources were both primary and secondary data. To enable an analysis of collected through questionnaire, Statistical Package for Social Sciences (SPSS) software (version 20) was used. mean family size the respondents 6.04. SDs cattle holding per household (8.38±4.91). total (67.9%) having not have owned grazing land their dairy cows. Tryponomiasis disease (Gendi) ranked first, Pasteurel...

An important branch of the modern global economy is food production. Our focus is milk production on dairy farms, the period in which cows produce milk (lactation) and the quantity of milk produced. Special attention will be given to the time-dependent function that describes the quantity of the milk produced over a lactation period. The respective graph is known as the lactation curve and is o...

OBJECTIVES The three objectives of this study were to determine the positive predictive value (PPV) of oestrus diagnosis (heat detection accuracy) by dairy farmers, calculate the diagnostic sensitivity and specificity of the P4 Rapid milk progesterone assay for detecting a corpus luteum and evaluate the economics of using a cow-side milk progesterone assay designed to aid oestrus diagnosis. M...

This study describes the occurrence of preterm calving in Great Britain and evaluates its associations with subsequent milk production and reproductive performances and survival on farm of dairy cows. A total of 53 British dairy farms and 5759 animals with detailed breeding and milk recording data available were used to form two study groups: preterm calving (calving occurring between days 266 ...

al implications for stakeholders: Automatic milking systems (AMS)s can be operated successfully within a grass based milk production system and milk yields comparable to many commercial batch milking systems can be achieved when grazing management is managed in order to control cow traffic The fact that milk yield/cow/day was not significantly affected by reducing milking frequency from 1.8 to ...