scholarly journals Risk factors relating to helminth infections in cows during the peripartum

2012 ◽  
Vol 21 (2) ◽  
pp. 92-96 ◽  
Author(s):  
Jenevaldo Barbosa da Silva ◽  
Charles Passos Rangel ◽  
Bruna de Azevedo Baêta ◽  
Adivaldo Henrique da Fonseca
Keyword(s):  
Risk Factors ◽  
Linear Regression ◽  
Dairy Cows ◽  
Milk Production ◽  
Gastrointestinal Nematodes ◽  
Helminth Infections ◽  
Productive Potential ◽  
Peripartum Period ◽  
Spearman Test ◽  
Selection Of

The aim of this study was to investigate whether season, lactation number, breed standard and milk production were risk factors relating to occurrences of gastrointestinal nematodes in dairy cows during the peripartum period. Eighty-four cows were randomly selected through proportional stratified sampling. In order to analyze the fecal egg per gram (EPG) count, the data were subjected to the Spearman test, Kruskal-Wallis test at 5% significance and linear regression. At the time of calving, the cows showed high EPG counts in relation to all variables analyzed. Among the animals studied, we observed that purebred Holstein cows at their first lactation and with high milk production showed high EPG counts (600) and comprised the group most at risk within the herd studied. In this group, the animals showed moderate EPG during the prepartum period (300) and a significant increase (p < 0.01) in EPG count from the time of calving (900), i.e. an increase of the order of 300%. Selection of animals for milk production in tropical countries should be based not only on productive potential, but also on adaptive features.

Genetic variation of rectal temperature and its relationship to milk production in Holstein dairy cows

2009 ◽  
Vol 2009 ◽  
pp. 63-63
Author(s):  
S Khalajzade ◽  
N Emam Jomeh ◽  
A Salehi ◽  
A Moghimi Esfandabadi
Keyword(s):  
Heat Stress ◽  
Dairy Cows ◽  
Milk Production ◽  
Heat Tolerance ◽  
Rectal Temperature ◽  
Weather Factors ◽  
And Performance ◽  
Very High ◽  
Selection Of ◽  
Holstein Dairy Cows

Milk production is significantly decreased by thermal stress. The survival and performance of an animal during heat stress periods depend on several weather factors, especially temperature and humidity. Researchers reported dramatic decreases in milk production as temperature rose above 30 degree of centigrade. Very high environmental temperature is common during the summer months in Iran. Rectal temperature is as indicator of heat tolerance and has been the most frequently used physiological variable for estimating heat tolerance in cattle. Some dairy cows are more heat tolerant and productive when subjected to heat stress. Identification and selection of heat stress resistant cattle offers the potential to increase milk yield in tropical environment. The aim of the present study was to estimate genetic parameters of heat tolerance and its relationship to milk production in Holstein Dairy Cows in Iran.

Estimation of intake and digestibility of forage-based diets in group-fed dairy cows using alkanes as markers

1999 ◽  
Vol 133 (4) ◽  
pp. 419-425 ◽  
Author(s):  
Y. UNAL ◽  
P. C. GARNSWORTHY
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Dry Matter ◽  
Dry Matter Intake ◽  
Once Daily ◽  
Major Factors ◽  
Filter Papers ◽  
Selection Of ◽  
Basal Ration ◽  
Food Consumed

Dry matter intake is one of the major factors limiting milk production in dairy cows, although the quantity of food consumed by an individual cow when housed and fed as part of a group is rarely known. Such information would permit more precise ration formulation, concentrate allocation and selection of cows according to efficiency of milk production. Alkanes have been used with sheep and cattle to estimate feed intake under grazing conditions and could provide a technique for measuring intake in housed dairy cows. The purpose of this study was to examine alkanes C32 and C36, in combination with alkane C33, as indigestible markers for estimating intake of housed dairy cows fed on different diets under experimental and commercial conditions. Three experiments were conducted with hay-based diets (Expt 1), silage only diets (Expt 2) and a diet consisting of a silage-based basal ration plus concentrates (Expt 3). Animals were dosed once daily with C32 and C36, either on filter papers (Expts 1 and 2) or as part of a specially prepared concentrate (Expt 3). Faecal recoveries of alkanes ranged from 0·88 to 0·99. Over the range of intakes found in the three experiments (6–24 kg DM/d), the r2 values for estimated versus actual dry matter intakes ranged from 0·81 to 0·99. It is concluded that alkanes could provide a useful technique for estimating intake in dairy cows housed and fed in groups.

Economic impacts of reduced milk production associated with papillomatous digital dermatitis in dairy cows in the USA

2006 ◽  
Vol 73 (2) ◽  
pp. 244-256 ◽  
Author(s):  
Willard C Losinger
Keyword(s):  
Risk Factors ◽  
Dairy Cows ◽  
Milk Production ◽  
Economic Impacts ◽  
Consumer Surplus ◽  
Economic Loss ◽  
Economic Effects ◽  
Digital Dermatitis ◽  
Economic Surplus ◽  
The Usa

The goal of this study was to measure the economic impacts of reduced milk production associated with papillomatous digital dermatitis (PDD) in dairy cows in the USA, and of specific risk factors for PDD, in 1996. The method applied was an economic-welfare analysis of producer and consumer surplus, with the GUM Workbench used to analyse uncertainties in the measurements. Reduced milk production associated with PDD was found to reduce consumer surplus by $750 million±$580 million, and to increase the economic surplus of producers by $560 million±$470 million, with a net economic loss of $190 million±$130 million. An examination of the economic effects of specific epidemiologic risk factors for PDD showed that having dairy cows that were not born on the operation had important economic consequences associated with the disease, as did the type of land to which dairy cows had access during the winter months and the type of flooring on which cows walked. Washing hoof-trimming equipment between cows was an important biosecurity measure that was associated with reduced PDD. The epidemiologic model used also implicated hoof trimmers who trimmed cattle hooves on other operations as having an important economic impact associated with this disease, although this finding may have been erroneous.

scholarly journals Assessment of Blood Metabolites Disorders and Related Pathological Risk Factors in Cows of Constantine Region, Algeria

2020 ◽  
Vol 77 (2) ◽  
pp. 42
Author(s):  
Adel MAMMERI ◽  
Fatima Zohra KAYOUECHE ◽  
Loubna DENHADJI ◽  
Abdelmalek BENMAKHLOUF
Keyword(s):  
Risk Factors ◽  
Health Status ◽  
Dairy Cows ◽  
Milk Production ◽  
Feeding Practices ◽  
Blood Metabolites ◽  
Total Proteins ◽  
Anova Test ◽  
Calcium Phosphorus

The aim of the present study is to evaluate some blood metabolites and to predict the occurence of nutritional imbalances affecting milk production and health status of cows. It included 180 dairy cows of five different breeds reared in five farms of Constantine Governorate. The biochemical analyzes via Technicon RA-X and RA-1000 autoanalyzers focused on: calcium, phosphorus, total proteins, lipids, glucose and creatinine.It results that hyperphosphatemia (> 65 mg/L) was clear in cows of farms 1 and 2 and moderate in those of farm 3; moderate hypocalcemia (< 97mg/L) in cows of farms 1, 2, 3 and 4; moderate hypoproteinemia (< 67 g/L) in farms 2 and 5; moderate hyperproteinemia (> 74.6 g/L) in farms 3 and 4, a clear hypercholesterolemia in whole farms. The significant differences (P< 0.01) via ANOVA test between farms, suggest variability of management methods, feeding practices and health status of cows.

Risk factors for clinical ketosis and association with milk production and reproduction variables in dairy cows in a hot environment

2018 ◽  
Vol 50 (7) ◽  
pp. 1611-1616 ◽  
Author(s):  
M. Mellado ◽  
A. Dávila ◽  
L. Gaytán ◽  
U. Macías-Cruz ◽  
L. Avendaño-Reyes ◽  
...  
Keyword(s):  
Risk Factors ◽  
Dairy Cows ◽  
Milk Production ◽  
Hot Environment

scholarly journals Hubungan antara Morfologi Ambing, Produksi Susu dan Komponen Susu pada Sapi Friesian Holstein

2019 ◽  
Vol 19 (2) ◽  
pp. 91-98
Author(s):  
Dian Wijayanti Solechah ◽  
Dian Wahyu Harjanti ◽  
Rudy Hartanto
Keyword(s):  
Linear Regression ◽  
Dairy Cows ◽  
Milk Production ◽  
Significant Relationship ◽  
Regression Equation ◽  
Coefficient Of Determination ◽  
Simple Linear Regression ◽  
Holstein Friesian ◽  
Livestock Productivity ◽  
The Relationship

ABSTRAK. Ukuran-ukuran ambing merupakan salah satu indikator yang menentukan produksi susu sapi perah. Morfologi ambing dapat digunakan untuk menilai produktivitas ternak. Penelitian ini bertujuan untuk mengetahui hubungan antara ukuran-ukuran ambing, produksi susu dan komponen susu. Materi yang digunakan yaitu 30 ekor sapi (Friesian Holstein) FH periode laktasi III-V dan bulan laktasi 3-4. Analisis yang digunakan adalah regresi linier sederhana dengan SPSS 16. Hasil penelitian menunjukkan ada hubungan yang nyata (P 0,05) antara kedalaman ambing belakang dan panjang ambing terhadap produksi susu secara berturut-turut dengan persamaan regresi Y = -1,142 + 0,435 X (r = 0,494 dan R2 = 0,244),Y = -9,197 + 0,463 X (r = 0,625 dan R2 = 0,390), lebar ambing belakang terhadap produksi susu dan jarak antar puting depan dengan produksi susu dengan persamaan regresi secara berturut-turut Y = 1,236 + 0,28 X (r = 0,397 dan R2 = 0,157) dan Y = 17,203-0,996 X (r = 0,367 dan R2 = 0,134). Kesimpulan yang didapat bahwa ada hubungan antara ukuran-ukuran ambing dengan produksi susu sapi Friesian Holstein, dimana terdapat hubungan yang signifikan antara kedalaman ambing belakang, panjang ambing serta lebar ambing belakang dan jarak antar puting depan dengan produksi susu dengan koefisien korelasi (r) tertinggi sebesar 0,625 dan koefisien determinasi (R2) sebesar 39%.  (Relationship between udder morphology, milk production and milk components of friesian holstein cows) ABSTRACT. The size of the udder is one indicator that determines the production of dairy cows. The udder morphology can be used to assess livestock productivity. This study aimed to determine the relationship between udder measurements, components of milk and milk production. The material used was 30 Holstein Friesian (FH) lactation periods III-V and lactation months 3-4. The analysis used was a simple linear regression with SPSS 16. The results showed a significant relationship (P 0.05) between the depth of the udder and length of the udder to milk production in a row with the regression equation Y = -1,142 + 0,435 X (r = 0,494 and R2 = 0,244), Y = -9,197 + 0,463 X (r = 0,625 and R2 = 0,390), width of the rear udder to milk production and the distance between the front nipple and milk production with consecutive regression equation Y = 1,236 + 0,28 X (r = 0,397 and R2 = 0,157) and Y = 17,203 – 0,996 X (r = 0,367 and R2 = 0,134). The conclusion that there is a relationship between udder measurements with Holstein Friesian milk production, where there is a significant relationship between the depth of the udder, udder length and width of the udder and the distance between the front nipples with milk production with the highest correlation coefficient (r) of 0,625 and the coefficient of determination (R2) of 39%.

scholarly journals Service Sire Effects on Body Condition Score, Milk Production, and Rebreeding of Mixed-Aged Dairy Cows Bred to Angus and Hereford Bulls—A Case Study in New Zealand

Dairy ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 637-648
Author(s):  
Lucy Coleman ◽  
Penny Back ◽  
Hugh Blair ◽  
Nicolas López-Villalobos ◽  
Rebecca Hickson
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Body Condition ◽  
Body Condition Score ◽  
Live Weight ◽  
Gestation Length ◽  
Beef Breed ◽  
Condition Score ◽  
Selection Of

Beef-breed bulls are used in dairy herds to produce a calf of greater value for finishing than calves sired by dairy bulls. There is limited research about which beef-breed bulls are most appropriate, and whether any negative impact on cow performance in terms of milk production and rebreeding should be considered. The aim of this case study was to compare the body condition score, milk production, and rebreeding performance of mixed-aged dairy cows bred to a selection of Angus and Hereford beef-breed bulls. Body condition score, post-calving live weight, milk production, rebreeding performance, and survival of 952 mixed-aged dairy cows artificially bred to 65 Angus and Hereford bulls were compared. There was no effect of service sire on post-calving live weight, days in milk, milk production, or inter-calving intervals of mixed-aged cows. Service sire had an effect on the calving day due to differences in gestation length (p < 0.001), although this did not translate into an effect on days in milk. A longer gestation length negatively influenced pregnancy rates, and greater birth weight of the calf negatively influenced survival to rebreeding (p < 0.05), indicating the potential for an effect of service sire. Selection of beef-breed service sires for dairy cows should include emphasis on lighter calves and shorter gestation lengths. The general absence of the service sire effect on the parameters measured in this study indicated that any of the service sires used in this experiment would be appropriate for use over dairy cows.

LIME AND DAIRY PRODUCTION

1982 ◽  
pp. 93-103
Author(s):  
N.A. Thomson
Keyword(s):  
Soil Moisture ◽  
Dairy Cows ◽  
Milk Production ◽  
Soil Ph ◽  
Dairy Production ◽  
Pasture Production ◽  
The Third ◽  
One Year ◽  
Plasma Magnesium

In a four year grazing trial with dairy cows the application of 5000 kg lime/ ha (applied in two applications of 2500 kg/ha in winter of the first two years) significantly increased annual pasture production in two of the four years and dairy production in one year. In three of the four years lime significantly increased pasture growth over summer/autumn with concurrent increases in milk production. In the last year of the trial lime had little effect on pasture growth but a relatively large increase in milkfat production resulted. A higher incidence of grass staggers was recorded on the limed farmlets in spring for each of the four years. In the second spring immediately following the second application of lime significant depressions in both pasture and plasma magnesium levels were recorded. By the third spring differences in plasma magnesium levels were negligible but small depressions in herbage magnesium resulting from lime continued to the end of the trial. Lime significantly raised soil pH, Ca and Mg levels but had no effect on either soil K or P. As pH levels of the unlimed paddocks were low (5.2-5.4) in each autumn and soil moisture levels were increased by liming, these factors may suggest possible causes for the seasonality of the pasture response to lime

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