scholarly journals Age at first conception of high yielding cows

2011 ◽  
Vol 27 (3) ◽  
pp. 1043-1050 ◽  
Author(s):  
Z. Novakovic ◽  
Lj. Sretenovic ◽  
S. Aleksic ◽  
M.M. Petrovic ◽  
V. Pantelic ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Milk Production ◽  
Objective Assessment ◽  
Limiting Factor ◽  
Accurate Evaluation ◽  
Black And White ◽  
Holstein Friesian ◽  
Key Factor ◽  
High Production ◽  
Fertility Traits

Black and White low land dairy cattle have very pronounced ability for high production of milk. Fertility is the major trait of cattle and key factor in successful milk production. Fertility traits have pronounced variability and low heritability value. Fertility is regularly limiting factor in attempts to increase the milk yield. Age of dairy cattle at first conception is one of the major reproduction properties. Age of calves at first calving depends mainly on age at first conception. Previous researches have indicated what would be the optimum age at first conception of Black and White heifers. Age at first conception is determined by the date of birth and date of first conception. Knowledge of the strength of the environment factors on age at first conception in high yielding cows is important from the aspect of their inclusion into the model. According to the significance of individual systematic factors, their objective assessment was carried out for the purpose of accurate evaluation of obtained results. Objective of this paper is to study the age at first conception of high yielding Black and white cows through major systematic influences, by applying adequate methodology. Cows comprising the studied sample (n=331) belong to European type of Black and White dairy cattle in final stage of improving of this breed with Holstein-Friesian breed. Average age of dairy cattle at first conception was 491.19?9.36 days or 16.15?0.31 months. According to cows? the values were following: 479.31 days (> 73% HF), 486.12 days (58-73%HF) and 508.14 days (< 58% HF).

Comparison of milk production, mastitis, lameness and days to conception of Brown Swiss, Holstein and Holstein cross Brown Swiss dairy cattle

2006 ◽  
Vol 2006 ◽  
pp. 86-86
Author(s):  
G Wellwood ◽  
J K Margerison
Keyword(s):  
Dairy Cattle ◽  
Somatic Cell ◽  
Milk Production ◽  
Milk Yield ◽  
Complex Disease ◽  
Economic Loss ◽  
Brown Swiss ◽  
Somatic Cell Counts ◽  
Cell Counts ◽  
Holstein Friesian

Mastitis is a complex disease causing inflammation of the udder, which has been estimated to cost the dairy farmer between £40-£117/cow per year (Stott et al., 2002). Economic loss occurs as a result of discarded milk, reduced milk yield and milk quality, increased vet costs and an increase in replacement costs. The objective of this study was to examine the effect of breed on the incidence of mastitis and somatic cell counts and milk production capabilities of Holstein Friesian, Brown Swiss and Brown Swiss crossbred cows.

State and prospects of the development of dairy cattle industry in the Stavropol territory

2021 ◽  
pp. 11-16
Author(s):  
N. V. Sulyga ◽  
G. P. Kovaleva ◽  
M. N. Lapina ◽  
V. A. Vitol
Keyword(s):  
Dairy Cattle ◽  
Milk Production ◽  
Objective Assessment ◽  
Short Term ◽  
State Support ◽  
Agricultural Producers ◽  
Cattle Industry ◽  
Genetic Potential ◽  
Dairy Cattle Breeding ◽  
Agricultural Organizations

This article presents the analysis of the state of dairy cattle industry and its short-term development prospects in connection with the crisis of 2020.  For the purposes of objective assessment, we considered the period of 2015-2019 and presented the dynamics of the main statistical indicators with significant state support (grants, subsidies, etc.) for agricultural producers. In 2019 the total amount of disbursed funds was more than 1.4 billion rubles, most of which were directed to the development of dairy cattle breeding. According to the results of 2019, 73.9% in milk-production structure accrue to personal subsidiary farms, 19.6% - to agricultural organizations and 6.5% - to private farms. The significant share of produced milk in the Stavropol territory accrues to personal subsidiary farms; at the same time, the increase in milk production was 26.5% (643.8 thousand tons). Alongside the reduction of livestock in the general population of milk cattle in the Stavropol territory it is obvious that the genetic potential of cows increases due to the decrease of low-productivity animals and wide-scale import of high-producing breeding heifers, both from abroad and domestic market. The topical problems of the industry are low reproductive qualities of cows (the output of calves in agricultural organizations is only 75%), the violations of feeding technologies and animals housing due to insufficient availability of specialists. In general, industry development rate is quite high and has significant potential for production increase in short-term prospect, provided that the existing state-support programs continue. The most relevant trends are the increase of genetic potential of productivity in Stavropol livestock population, the adoption of state-of-the-art technologies for livestock keeping and feeding, as well as the development of farming and the niche of organic products.

Linear and threshold model genetic parameters for disease, fertility and milk production in dairy cattle

2000 ◽  
Vol 27 ◽  
pp. 83-84
Author(s):  
H. N. Kadarmideen ◽  
R. Thompson ◽  
G. Simm
Keyword(s):  
Animal Models ◽  
Dairy Cattle ◽  
Milk Production ◽  
Genetic Parameters ◽  
Linear Models ◽  
Threshold Model ◽  
Genetic Selection ◽  
Good Health ◽  
Economic Loss ◽  
Fertility Traits

A combination of better management and genetic selection for good health and fertility would provide a more effective long term solution for economic loss due to diseases and poor fertility. This would also help to address public concerns about the use of medical treatment in milk production. A balance in the genetic improvement of health and fertility together with milk production could be achieved through their inclusion in national genetic selection indices, for which genetic parameters are needed. One of the main objectives of this study was to estimate genetic parameters for various disease and fertility traits in the UK dairy cattle population, using records from a national recording scheme run by Livestock Services UK Ltd. Genetic analysis of traits recorded as present or absent (binary traits; e.g. diseases) requires the use of non-linear threshold models, because linear models require normality assumptions (e.g., Gianola 1982). The other objective of this study was to estimate genetic parameters for binary disease and fertility traits based on threshold animal models and to compare results with those from linear animal models.

scholarly journals Genetic potential of milk productivity of black-and-white cows depending on selection and management

2020 ◽  
Vol 17 ◽  
pp. 00158
Author(s):  
Alexander Lyubimov ◽  
Ekaterina Martynova ◽  
Yulia Isupova ◽  
Ekaterina Yastrebova ◽  
Elena Achkasova
Keyword(s):  
Dairy Cattle ◽  
Milk Production ◽  
System Technology ◽  
Milk Productivity ◽  
Genetic Progress ◽  
Black And White ◽  
Traditional Technology ◽  
Genetic Potential ◽  
Livestock Productivity

Currently an increasing attention is paid to breeding animals ensuring the greatest genetic progress of populations in livestock productivity, i.e. stud bulls. Hence, the study of the realization degree of genetic potential of productivity of dairy cattle with different ecogenesis in the conditions of industrial and traditional technology of milk production seems quite relevant. The study revealed that the degree of realization of genetic potential of stud bulls in traditional (tied-up system) and industrial (cubicle system) technology is different.

Relationships among udder type traits and milk yield of Iranian Holstein-Friesian cattle

2003 ◽  
Vol 2003 ◽  
pp. 141-141
Author(s):  
M. R. Sanjabi ◽  
M. G. Govindaiah ◽  
M. M. Moeini
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Genetic Correlations ◽  
Holstein Friesian ◽  
Type Traits ◽  
High Production ◽  
Friesian Cattle

Correlation among type traits and with milk production has been investigated by Brotherstone (1994) and Misztal et al (1992). One of the primary reasons for collecting and utilizing information on type traits is to aid breeders in selecting profitable functional cows for high production and suitable herd life. The objectives of this study were to estimate phenotypic and genetic correlations among milk production and with udder traits.

The effect of two levels of nutrient intake on milk production of two dairy cow genotypes

2002 ◽  
Vol 2002 ◽  
pp. 12-12 ◽  
Author(s):  
T.W.J. Keady ◽  
C.S. Mayne
Keyword(s):  
Dairy Cattle ◽  
Milk Production ◽  
Dairy Cow ◽  
Nutrient Intake ◽  
Selection Procedure ◽  
Nutrient Input ◽  
Selection Procedures ◽  
Grass Silage ◽  
Holstein Friesian ◽  
Breeding Programmes

Breeding goals differ for different breeds of dairy cattle. For example the breeding programmes for Holstein-Friesian (HF) animals have been based primarily on improved milk production with little emphasis on functional traits such as fertility. In contrast, Norwegian (NC) dairy cattle have been bred using a multi-trait selection procedure for 25 years. These differences in selection procedures for the two breeds may have major effects on overall herd output and profitability with the forage-based systems of milk production employed in Northern Ireland. The objective of the present paper is to present the effects of two levels of nutrient input on food intake and utilisation, and animal performance of the two breeds, with diets based on grass silage during the first and second lactation.

Linear and threshold model genetic parameters for disease, fertility and milk production in dairy cattle

2000 ◽  
Vol 71 (3) ◽  
pp. 411-419 ◽  
Author(s):  
H. N. Kadarmideen ◽  
R. Thompson ◽  
G. Simm
Keyword(s):  
Dairy Cattle ◽  
Milk Production ◽  
Fixed Effects ◽  
Genetic Parameters ◽  
Threshold Model ◽  
Production Traits ◽  
Milk Production Traits ◽  
Model Framework ◽  
Data Set ◽  
Fertility Traits

AbstractThis study provides estimates of genetic parameters for various diseases, fertility and 305-day milk production traits in dairy cattle using data from a UK national milk recording scheme. The data set consisted of 63891 multiple lactation records on diseases (mastitis, lameness, milk fever, ketosis and tetany), fertility traits (calving interval, conception to first service, number of services for a conception, and number of days to first service), dystocia and 305-day milk, fat and protein yield. All traits were analysed by multi-trait repeatability linear animal models (LM). Binary diseases and fertility traits were further analysed by threshold sire models (TM). Both LM and TM analyses were based on the generalized linear mixed model framework. The LM included herd-year-season of calving (HYS), age at calving and parity as fixed effects and genetic, permanent environmental and residual effects as random. The TM analyses included the same effects as for LM, but HYS effects were treated as random to avoid convergence problems when HYS sub-classes had 0 or 100% incidence. Because HYS effects were treated as random, herd effects were fitted as fixed effects to account for effect of herds in the data. The LM estimates of heritability ranged from 0•389 to 0•399 for 305-day milk production traits, 0•010 to 0•029 for fertility traits and 0•004 to 0•038 for diseases. The LM estimates of repeatability ranged from 0•556 to 0•586 for 305-day milk production traits, 0•029 to 0•086 for fertility traits and 0•004 to 0•100 for diseases. The TM estimates of heritabilities and repeatabilities were greater than LM estimates for binary traits and were in the range 0•012 to 0•126 and 0•013 to 0•168, respectively. Genetic correlations between milk production traits and fertility and diseases were all unfavorable: they ranged from 0•07 to 0•37 for milk production and diseases, 0•31 to 0•54 for milk production and poor fertility and 0•06 to 0•41 for diseases and poor fertility. These results show that future selection programmes should include disease and fertility for genetic improvement of health and reproduction and for sustained economic growth in the dairy cattle industry.

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