Papers by Snežana Trivunović
Contemporary Agriculture, Nov 30, 2023
This research aims to estimate heritability and repeatability based on the data on milk productio... more This research aims to estimate heritability and repeatability based on the data on milk production traits (MYmilk yield; FYmilk fat yield; FCmilk fat content; PYmilk protein yield and PCmilk protein content) as well as pedigree and genomic information. A total of 6,041 animals were included in the research, while 2,565 of them had data for milk production traits. In order to form a genomic relationship matrix, 58K SNP data were used for a total of 1,491 cows. Several software tools were used in the preparation and analysis of data, which were provided by the Central Breeding Organization,
Animals, Feb 8, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Zenodo (CERN European Organization for Nuclear Research), Dec 15, 2011
Zenodo (CERN European Organization for Nuclear Research), Jun 15, 2012
Zenodo (CERN European Organization for Nuclear Research), Jun 15, 2012
The objective of the research was to investigate the significance of the main systematic effects ... more The objective of the research was to investigate the significance of the main systematic effects on productive life of high yielding<br> Black-and-White dairy cows. The average length of productive life reached 1494.18±463.66 days Observed by genotypes, the mean values were as follows: 1377.35 days (>73% HF), 1477.47 days (58-73% HF) and 1627.71 days (<58% HF). Differences in length of productive life came as a result of highly significant (P≤0.01) effect of the class of HF genes, bull sires and year of culling, whereas the reason for culling had no significant effect (P>0.05).
African Journal of Biotechnology, 2011
Improvement of production capacity of cattle in terms of increasing the production of milk, milk ... more Improvement of production capacity of cattle in terms of increasing the production of milk, milk fat and number of calves, greatly depends on phenotype and genotype variability, heritability and correlation between desirable traits, as well as on the production level of the cattle population. Heritability, as a value expressing and measuring average additive gene effect, is one of the major characteristic of quantitative traits from the point of view of creating genetically high-value cattle populations. Knowledge of the heritability is necessary in the estimation of the beeeding value of cattle and has significant impact on the selection of breeding method. Genetic correlations are very important in indirect selection where changes in one trait are induced through selection of other traits between which a genetic correlation exists. Genetic correlations can be determined in all cases where heritability coefficient can be calculated. This research included 3.461 first calving Simmen...
Archives Animal Breeding, 2010
Group of secondary traits such as health, longevity, type and milkability represents some of very... more Group of secondary traits such as health, longevity, type and milkability represents some of very important factors for successful milk production. These traits have been given great importance in recent years. In order to realize productive life of dairy cows as long and successful as possible, special attention should be directed to traits of type and body constitution. Objective of the research was to establish heritability coefficients for 14 type traits of first calving Black and White cows, effect of genetic and paragenetic factors (bull sires, farm, year and season of calving, age at scoring and share of Holstein-Friesian [HF] genes) on type traits, so that these scores could be included in calculation of breeding value of the animal. Also, average values of milk traits have been established: milk yield and yield of 4 % fat corrected milk (FCM), content and quantity of milk fat. Evaluation was performed on a sample of 2 976 first calving Black and White cows. Evaluated cows were reared on 7 farms of the Agricultural Corporation Belgrade in Serbia. Analysis of discontinuous and continuous influences was done using the method of least squares. Investigation indicated that the value of linear type evaluation should be included in the total evaluation of the breeding value and in this way complete insight into genetic supremacy, especially of breeding bulls, would be obtained. Use of bull semen of proven supremacy in transmission of genes desirable from the aspect of body constitution, in the process of artificial insemination, would lead faster to production herds with animals which are uniform in type, of good conformation and longevity, which is of special significance in conditions of intensive rearing of dairy cattle.
Acta Scientific Agriculture, 2019
Random Regression Model for Genetic Analysis Milk Traits Holstein Friesian Cow 40. Vidovic V. "Co... more Random Regression Model for Genetic Analysis Milk Traits Holstein Friesian Cow 40. Vidovic V. "Coefficients of inheritance and correlation of more important dairy properties in the first two lactation of the cattle-breeding cows". Livestock (1986): 9-10. 41. Jovanovac Sonja. "A estimate of the cultivation of the Bulls Holstein-Friesa Pasmina in the conditions of Slavonia and Baranje". PhD disorientation. Ljubljana (1987). 42. Stojić P. "Factors of correction of the characteristics of dairy and their contributions evaluate the breeding values of bulls and cows". PhD discothethesis. Faculty of Agriculture, Belgrade (1996). 43. Mosharraf R., et al. "Estimation of (co)variance components and breeding values for test-day milk production traits of Holstein dairy cattle via Bayesian approach". Biotechnology in Animal Husbandry 30 (2014): 15-28. 44. Djurdjevic R and Vidovic V. "The assessment of genetic and phenotygenic parameters of the dairy of the Simental race". Modern farming. number three, Novi Sad (1994). 45. Swalve HH. "The Effect of Test Day Models on the Estimation of Genetic Parameters and Breeding Values for Dairy Cattle".
The Journal "Agriculture and Forestry", 2018
The objective of this study was to investigate genetic polymorphism of the alpha S1 casein gene a... more The objective of this study was to investigate genetic polymorphism of the alpha S1 casein gene and its association with milk production parameters (milk yield and milk composition) of indigenous Balkan goat breed reared in Montenegro. Two genetic variants (A and F) and three genotypes AA, AF and FF of alpha S1-casein have been identified. The analysis showed a prevalence of strong A allele (0.626) compared to the weak F allele (0.374), while the frequencies of genotypes were 0.398, 0.456 and 0.146 respectively. The effect of genotype of alpha S1 casein on the total milk yield, length of lactation and daily milk yield was not significant (p>0.05), while it is significantly influenced to the milk composition parameters. Goats with AA genotype of alpha S1 casein had significantly higher (p<0.001) average content of protein (3.54%) than AF and FF genotype (3.40% and 3.33%). The same genotypes order were for fat content and solid non-fat content (AA>AF>FF) with significant differences (p<0.05) of AA genotype in comparison to AF and FF. Genetic characterization of the alpha S1-casein gene contributes to the knowledge of the genetic structure of Balkan goat breed in Montenegro. These results could be important for establishing of the concept of conservation and sustainable use of this indigenous goat breed, as well as for selection scheme and breeding program.
Biotehnologija u stocarstvu, 2016
Possible differences between composition of raw milk due to dairy farming system (organic vs conv... more Possible differences between composition of raw milk due to dairy farming system (organic vs conventional) as well as seasonal variations were investigated. The samples were analysed during one year. A total of 6.782 samples of raw milk were collected (4.496 from organic farming). Dairy farms were located in the northern part of Republic of Serbia (Province of Vojvodina). The principle of analysis of raw milk samples was in accordance with the methodology by midinfrared spectrometry and flow cytometry. The fixed effect of system of farming and season (winter, spring, summer and fall) have shown a high statistical significance (P < 0.01) on all examined milk parameters except fat, total solids and somatic cell count, where the impact was slightly lower (P < 0.05). Significant difference wasn't found in number of bacterial colonies (P > 0.05). Composition of milk is also affected by a number of other factors, therefore it is recommended to involve factors such as nutritio...
World's Poultry Science Journal, 2013
This paper focuses on identification, risk status, exterior and production characteristics of two... more This paper focuses on identification, risk status, exterior and production characteristics of two autochthonous hen breeds, the Banat Naked Neck and the Sombor Crested in the Republic of Serbia. These are two autochthonous breeds which have preserved the original characteristics of domestic poultry. Today they are reared in rural households or by breeders in small flocks. They mainly reproduce naturally, under brooding hens, with moderate attention or care from the farmer. These breeds are highly endangered. It is estimated that the total number of birds of the Banat Naked Neck breed ranges from 5,000 to 6,000 while the number of birds of the Sombor Crested breed is below 1,000. The limited number of birds per breed and the absence of experts and professional control in breeding have caused high variability of breed characteristics. These breeds are of combined type, used for production of meat and eggs; they have lower production characteristics, but are highly resistant and low-ma...
Biotehnologija u stocarstvu, 2012
In order to have a more precise description of dairy farm structure and characteristics of dairy ... more In order to have a more precise description of dairy farm structure and characteristics of dairy production systems, as well as to assess possibilities for improving production and farming conditions in which milk production is organized, a survey based research was directed at a select group of farms across the Serbia. 1180 questionnaires have been mailed to farmers whose farms are registered for either cattle or mixed production. Questionnaire was divided into 6 sections: general information of the farm, agricultural and structural information, zootechnical information, sanitary and veterinarian information, information about education and extension, and information on the perspectives of future farming. About 59% of analyzed farms have size up to 20 ha, with average size of about 10 ha. On the other hand, about 55% farms raises up to 15 cows and heifers with average of 6 heads per farm, while 3% of farms have more than 200 cows and heifers. Over 86% of surveyed farmers intend to ...
Biotechnology in Animal Husbandry, 2013
The aim of this paper was to determine the microclimatic conditions (ambient temperature and rela... more The aim of this paper was to determine the microclimatic conditions (ambient temperature and relative humidity) in dairy farm, as well as to evaluate the effect and significance of temperature - humidity index (THI) values on the daily milk yield. The observation of microclimatic parameters was conducted in the period from 9.03.2012 to 6.05.2012. The study included 136 Holstein Friesian cows. The estimation of the effect of THI on daily production of dairy cows was defined by applying fixed-effect statistical model. Average ambient temperature during measuring months amounted to 15.6?C (ranging from 7.2? C to 24.6?C), while the average value of relative humidity was 56.33% (ranging from 40.30% to 81.80%). During the study, the mean value of THI was 58.93 (ranging from 47.08 to 70.13) and didn?t exceed the critical comfort level of 72. All tested fixed-factors were statistically affected the daily milk yield (p <0.01). For each unit of increase in the value of the THI, the amount ...
Biotechnology in Animal Husbandry, 2011
The basis for selection work is knowledge of the quality of bull sires used for conception, as we... more The basis for selection work is knowledge of the quality of bull sires used for conception, as well as how the major traits are passed on to the progeny. BLUP method (Best Linear Unbiased Prediction) is the basis of the most favourable solution for evaluation of additive gene value in cattle production, and it is implemented in various variants depending on the structure of data used. This research included 2.121 Simmental first cavers under control, with lactations completed within one year. All first calvers were located on holdings of individual agricultural producers on the territory of the Republic of Serbia. Evaluation of the bull breeding value for lactation duration, milk production, milk fat yield, yield of 4% FCM and percentage of milk fat, was carried out by using the mixed model (BLUP), the calculation included random effect of bull sire and fixed effect of the region, year and season of calving. In this study, bull sires which had in two or three regions over 20 daughte...
Biotechnology in Animal Husbandry, 2011
The incidence of subclinical and clinical mastitis in the mammary gland produces variety of defen... more The incidence of subclinical and clinical mastitis in the mammary gland produces variety of defensive factors were nuclear leukocytes, lymphocytes and macrophages play an important role and they are marked as somatic cells. Somatic cell count depends on the type of pathogen and stage of infection. Increased number of somatic cells in milk occurs as a result of lesions in the mammary gland. Studies have shown that the somatic cells count is genetically predisposed. Although the heritability of this trait is low, using modern methods and the proper selection of work it is possible to achieve some progress. Therefore it is necessary to the selection of bulls for somatic cells, on the basis of somatic cells in milk of daughters. Data on milk yield and somatic cell count in milk of 247 cows Holstein Friesian and Simmental breed from Vojvodina province, were used to analyze the evaluation of breeding values for somatic cells in milk Average values and variability of somatic cells, milk yi...
Biotechnology in Animal Husbandry, 2011
Objective of this study was to analyze the effect of the dairy farm on milk traits of cows in Voj... more Objective of this study was to analyze the effect of the dairy farm on milk traits of cows in Vojvodina. The research was carried out on small farms with 10 to 20 cows, medium farms with 20 to 50 cows, and large farms with over 50 dairy cows. The study included registered animals of Simmental (SM) and Holstein-Friesian breed (HF; including Red Holstein) in the first lactation for traits of milk yield and yield and content of milk fat. Total of 1323 first lactations were analyzed. The average milk yield (both breeds) in the first lactation of 305 days was 6295 kg of milk with 234,3 kg of milk fat and average milk fat content of 3,74%. Milk performance of cows varied significantly (CV=22,9% and SD=1447,8), as well as milk fat yield (CV=21,6% and SD=50,8). Large farms produced in average 6534 kg of milk, medium farms 6347kg and small farms 4717kg. Size of the farm exhibited significantly high effect on all observed traits, and the tendency was that farms with higher number of animals r...
Biotechnology in Animal Husbandry, 2011
Objective of this study was to calculate the variability and heritability of type traits in the n... more Objective of this study was to calculate the variability and heritability of type traits in the nucleus herd of bull dams by using the linear method of evaluation, and to determine their importance in selection of cattle. Study included 127 Holstein-Friesian cows selected as bull dams on cattle farms of PKB Korporacija, Belgrade. By applying the Least square method, main variationstatistical parameters were calculated: arithmeitc mean, standard deviation, variation coefficient, standard error and variation range. Bull dams of Holstein- Friesian breed had average milk production of 10245.98 kg, with variation range from 6514 kg to 13251 kg. Average milk fat yield was 361.95 kg, and milk fat content 3,53%. Average values for type scores of Holstein-Friesian bull dams were: rump height 5.40, chest width 7.09, body depth 7.38, rump position 5.39, rump width 6.55, dairy form 7.35, rear legs set (rear view) 5.22, rear legs set (side view) 5.28, hoof angle 5.27, fore udder 6.65, front teat...
Zenodo (CERN European Organization for Nuclear Research), Jun 15, 2011
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Papers by Snežana Trivunović