Hrvatska poljoprivredna agencija

Zagreb, Croatia

Hrvatska poljoprivredna agencija

Zagreb, Croatia
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Cacic M.,Hrvatska poljoprivredna agencija | Simundza S.,Alkarska ergela d.o.o.
Poljoprivreda | Year: 2012

Breeding goal and selection measures in breeding of trotter horses are subjected to horses production with the fastest possible speed in trotting. Evaluation of racing horses' performances is important because of horse impact on horse industry. More valuable horses and larger prizing fond result in a higher attendance of hippodromes and more money paid in betting offices. Race horse industry notes a large number of data used in predictions during breeding of horses with better racing performances every year. Racing performances are affected by a large number of genetic and environmental (non-genetic) factors caused by different environmental effects. Therefore, they are more variable. The major genetic and environmental parameters used in the models of breeding values racehorses in this case trotters are reviewed in this paper.


Barac Z.,Hrvatska poljoprivredna agencija | Mioc B.,University of Zagreb | Spehar M.,Hrvatska poljoprivredna agencija
Mljekarstvo | Year: 2012

The objective of this study was to determine the effect of different breeding areas (south-west and north-east part of the island of Pag) on daily milk, fat and protein yield in Pag sheep. The aim of this study was also to determine the shape of lactation curves as well as the herd effect on Pag sheep milk traits. Research was conducted on 32 herds reared in the south-western (23) and north-eastern (9) part of the island of Pag. Data included 21.033 test-day records of 2.332 ewes. Daily milk yield and milk components were recorded using AT4 method for the period from 2004 to 2008. The rearing area had statistically significant effect on the daily milk yield (P<0.001), daily fat and protein yield. Ewes reared on the south-western part of the island had larger average daily production than ewes reared on its north-eastern part. The stage of lactation, described by Ali and Schaeffer lactation curve nested within rearing area, had significant effect (P<0.0001) on all milk traits. The peak of lactation production was achieved around the 20 th day of lactation in both areas and was somewhat higher for ewes kept in the south-western compared to the north-eastern part of the island. Flock nested within rearing area had statistically significant effect on all milk traits (P<0.0001). Results obtained in the study showed potential possibilities for breeders to enlarge milk production and consequently economically benefit through improved herd management of Pag sheep.


Filipi J.,Veleuciliste Marko Marulic u Kninu | Brajkovic J.,Hrvatska gospodarska komora | Drazic M.M.,Hrvatska poljoprivredna agencija | Bubalo D.,University of Zagreb | Kezic N.,University of Zagreb
Journal of Central European Agriculture | Year: 2012

Gacka region and northern slopes of Velebit are typical mountain meadow honey areas. Bees pasture is relatively stable, almost evenly distributed throughout the years. The aim of the research is to determine the characteristics of multi-floral honey in the Gacka region based on mellisopalinological and physicochemical analyses. In order to collect honey samples from Gacka region, honey competition was organized in 2008, 2009 and 2010. A total of 68 samples of honey were collected. According to botanical origin in 2008, 12 samples of floral honey, 1 meadow and 6 samples of honeydew honey were determined. In 2009 from total of 25 samples of honey, 7 samples were determined as floral honey, 6 meadow, and 12 samples as honeydew honey. From total of 24 samples of honey in 2010, 5 were determined as floral honey, 16 samples as meadow honey, 2 as sweet clover (Melilotus spp.) and 1 sample as Dorycnium (Dorycnium spp.). Water content in the studied honey samples ranged from 14.60 to 18.20% with a mean value of 16.32%. Floral honey samples from 2009 and 2010 had a higher pH values (4.97, 4.83) compared to the samples from 2008 when the value was 4.68. In the investigated samples of floral and meadow honey the share of reducing sugars ranged from 55.31% in 2008 year to 77.02% in 2010. Honey types were separated on the basis of physicochemical parameters using Canonical discriminant analysis. The strongest influence on honey type discrimination had electrical conductivity, HMF, acidity together with characteristic pollen spectrum and sensory properties.


Vrdoljak J.,MILS Mljekara Split d.d | Spehar M.,Hrvatska poljoprivredna agencija | Pavic V.,University of Zagreb | Mioc B.,University of Zagreb | Barac Z.,Hrvatska poljoprivredna agencija
Mljekarstvo | Year: 2012

The objective of this study was to analyse the effect of stage of lactation, parity, litter size, and lambing season on daily milk production and fat and protein content in Istrian sheep. Data included 9.533 test-day records of 2.024 ewes for the period from October 2005 to May 2009. Daily milk yield and fat and protein content were determined during monthly milking controls using AT4 method. The stage of lactation, described by Wilmink lactation curve, had significant effect (P<0.001) on all studied milk traits of Istrian sheep. The peak of daily milk production was achieved between the 20th and 30th day of lactation and gradually decreased towards the end of lactation. Lactation curves for fat and protein content had opposite shape compared to the daily milk yield lactation curve. Parity affected (P<0.05) the daily milk yield and protein content. Daily milk yield and protein content were the lowest in the first and the highest in the third parity. Statistically significant influence of litter size (P<0.05) was determined for daily milk yield and fat content. A higher daily milk yield and lower fat content was observed in ewes lambing twins compared to ewes lambing singles. Differences in daily milk yield and contents were observed for the lambing season effect (P<0.001). Istrian ewes lambed in December and November (first lambing season) had the highest daily milk production, while the lowest daily milk yield had ewes lambed in February.


The object of the present study was to analyse effect of polymorphic allelic variants of β-lactoglobulin, κ-casein and αs1-casein on total milk yield, fat and protein content in milk of Holstein, Simmental and Brown cattle breeds in Croatia during the first three standard lactations. Although the certain effects of polymorphic variants of β-lactoglobulin, κ-casein and αs1-casein on the level of milk yield in analyzed breeds of cattle are observed, those effects were not significant. The effect of polymorphic variants of β-lactoglobulin, κ-casein and αs1-casein on average fat content in milk of analyzed breeds has noticed, although differences were not significant. Differences in protein content in milk with different polymorphic variants of β-lactoglobulin, κ-casein and αs1-casein were not significant, except in case of BC genotype of αs1-casein, which was significant (P<0.05) on protein content in the milk of Holstein breed.


Gantner V.,Poljoprivredni fakultet u Osijeku | Mijic P.,Poljoprivredni fakultet u Osijeku | Kuterovac K.,Agrokor d.d | Solic D.,Hrvatska poljoprivredna agencija | Gantner R.,Poljoprivredni fakultet u Osijeku
Mljekarstvo | Year: 2011

The objectives of this study were to determine the microclimatic conditions in stables in three climactic regions (East, Mediterranean, and Central) of Croatia as well as to evaluate the effect of temperature-humidity index (THI) values on the daily production of dairy cattle. With that purpose, 1675686 test-day records collected from January 2005 until April 2010 were extracted from HPA (Croatian Agricultural Agency) database. For estimation of the effect of THI on daily production of dairy cows fixed-effect model that took into account the effects of lactation stage, breed, calving season, measuring season, and THI group (T1 - THI≤72; T2 - THI>72) was used. Model was applied to each class of parity (P1, P2, P3, P4 and P5) and region. During the analysed period, the highest monthly averages of ambient temperature were determined in Mediterranean region, the highest monthly averages of relative humidity were observed in Central region, while the highest monthly mean values of temperature-humidity index (THI) were determined in Mediterranean region. Heat stress conditions indicated with mean daily values of THI>72 were determined during spring and summer season in all analysed regions. Absence of heat stress conditions during autumn and winter season also characterised all three regions. Highly significant (P<0.01) decrease of daily milk yield as well as of daily fat and protein content due to enhanced THI was observed in all cows regardless the parity class and in all three climatic regions. Furthermore, the most deteriorate effect of heat stress was observed in East region. During heat stress period, with the aim of minimization of the effects of heat stress, it is necessary to regulate management strategies in the dairy herd.


Antunac N.,University of Zagreb | Samarzija D.,University of Zagreb | Mioc B.,University of Zagreb | Pecina M.,University of Zagreb | And 2 more authors.
Mljekarstvo | Year: 2011

Since the produced Paška sheep milk is entirely processed in Pag cheese, it is of great importance to ensure a uniform milk production of prescribed chemical composition and hygienic quality. In addition to genotype, as the most important factor, the production and quality of sheep milk is affected by numerous physiological factors, so the aim of this research was to determine the influence of paragenetic factors (stage and number of lactation) on daily milk yield and chemical composition (total solids, milk fat, protein, casein, lactose, total solids non fat) of Paška sheep milk. Three herds were chosen by random selection within the areas of Kolan and Caska, and survey was conducted on a total of 213 Paška sheep. Stage of lactation was divided to: the beginning (to 50 th-day), the middle (from 51 st till 100 th-day) and the end (101 st -day till dry out) of lactation. Depending on the number of lactation, sheep were grouped into five groups (1 st, 2 nd, 3 rd, 4 th, 5 th and others). A significant influence of stage and number of lactation on average daily milk yield and analysed chemical composition parameters was determined. The Paška sheep had the highest daily milk production in the mid-lactation (773 g), and the third lactation (712 g) recorded. At the end of lactation, total solids, milk fat, protein, casein, total solids non fat in milk were significantly higher than at the beginning and middle of lactation. The highest share of total solids, milk fat, protein and casein was determined in Paška sheep milk at 5 th lactation and other lactations. Between the individual parameters significant correlation coefficients were determined.


The objectives of this research were to determine significant effects on the duration of the period from calving to conception (service period), the relationship between the duration of the service periods and the traits recorded during the milk recording and develop a system of predicting the duration of service period based on the milk recording results in early lactation (the first two controls) in Holstein and Simmental cows population, which would consequently increase competitiveness and financial performance of the farm. Statistical analysis using survival analysis and logistic regression method included 14,864 Holstein cows with a total of 29,278 milk recording records and 18,708 Simmental cows with a total of 37,416 milk recording records. Correlation coefficient values were within the range ±0.00 to ±0.20 indicating a negligible correlation between the service periods duration and the traits recorded during the milk recording. Higher conception probability at all classes of service periods duration in the Simmental compared to the Holstein breed was determined using the analysis of movement survival curves for service period duration. Based on the results of logistic regression two statistical models were created. Model 1 includes traits recorded during the milk recording separately for each breed and each test day. Model 2, besides traits from model 1, also included effects of region, season of recording, herd size classes, season of conception and calving season. The power testing of the models for prediction of incident was shown using the concordance index representing the compliance agreement of recorded and predicted data within each model. The increase of the concordance index value was determined for each model with a higher number in comparison to the initial model. Additionally, the increase of the concordance index value was determined for control day 2 compared to the control day 1 for both analysed breeds. © 2015, Faculty of Agriculture in Osijek. All rights reserved.


The objective of this study was to evaluate the effect of lactation stage, parity, lambing season, and herd on fat and protein content in Pag sheep. Data included 21.033 test-day records of 2.332 ewes lambed between November 2003 and May 2008. Research was conducted in 32 herds (23 of them were reared in the south-western and 9 in the north-eastern part of the Pag Island). Daily milk yield and milk components were recorded using AT4 method in the routine milk recording scheme. The stage of lactation, described by Ali and Schaeffer lactation curve nested within rearing area, had significant effect (P<0.0001) on fat and protein content. The lowest fat and protein content was between the 20th (north-eastern part) and 30th day of lactation (south-western part) and increased towards the end of lactation. Parity also affected differences (P<0.0001) in milk components. The lowest estimated value was observed in the first and the highest in the eighth parity for both traits. Differences in fat and protein content as a result of lambing season were also observed (P<0.0001). Pag ewes lambed in December 2003 had the highest milk fat content, while the lowest value was observed in milk from ewes lambed in February 2004. Winter lambing ewes (December 2004) had the highest, while ewes lambed in December 2005 had the lowest estimated protein content. Flock nested within rearing area affected fat and protein content significantly (P<0.0001). Ewes reared in herds from north-eastern part of Pag Island had wider range of fat and protein content compared to ewes reared in herds from south-western part of Pag Island. The knowledge about effects that have influence on milk components in Pag sheep provides useful information to breeders in production organisation on their farms.


Bobic T.,Sveuciliste J. J. Strossmayera u Osijeku | Mijic P.,Sveuciliste J. J. Strossmayera u Osijeku | Gregic M.,Sveuciliste J. J. Strossmayera u Osijeku | Ivkic Z.,Hrvatska poljoprivredna agencija | Baban M.,Sveuciliste J. J. Strossmayera u Osijeku
Mljekarstvo | Year: 2013

Milkability traits have an increasing importance in modern cattle production, although they are the secondary selective trait. The machine milking of cows has indicated that there is no complete alignment between the machine and the animals, what lead to increasing duration of milking and disturbances in health of udder. Because of that, the aim of this study was to investigate the influence of the ordinal number of lactation and stage of lactation on milkability traits (amount of milk per milking (KMM), maximum milk flow rate (MPM), average milk flow rate (PPM), duration of the start of milk flow (tS500), duration of the ascending phase of milking (tUFM), duration of the plateau phase of milking (tPFM), duration of the descending phase of milking (tSFM), duration of the main phase of milking (tGFM)), and recommend the same for the selection work. The study was done on 322 Holstein cows in the period from the first to third lactation, arranged in three stages of lactation (the first of the 50-90 day, the second stage of the 91-135 day and a third of 136-180 day of lactation). The results showed that the ordinal number of lactation had a highly statistically significant influence (P<0.01) on KMM and MPM, and on the PPM and tGFM (P<0.05). Statistically significant influence of the stage of lactation on the KMM was recorded in the first and second lactation (P<0.05) respectively in the third lactation (P<0.01). Was recorded a significant positive influence of KMM (P<0.05) on the MPM, tPFM, tSFM and tGFM (r = from 0.22 to 0.52). The negative correlation of the MPM (P<0.05) was recorded with some parts of the milking phase duration (r = -0.14 to -0.47). The results indicate that there are opportunities for selection work to improve milkability traits, which can have a positive impact on the economy of expenditure of time during milking, and indirectly improve the health of the udder.

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