scholarly journals Reproductive characteristics of Simmental breed bull dams

2005 ◽  
Vol 21 (1-2) ◽  
pp. 13-20 ◽  
Author(s):  
Vlada Pantelic ◽  
Zlatko Skalicki ◽  
Milan Petrovic ◽  
Denis Kucevic
Keyword(s):  
Reproductive Traits ◽  
Dairy Production ◽  
Method Of Least Squares ◽  
Agricultural Producers ◽  
Mean Values ◽  
Service Period ◽  
General Average ◽  
Cattle Reproduction ◽  
Significant Production ◽  
Duration Of Pregnancy

Cattle reproduction is most significant production phase because in this phase heads of cattle for maintaining of the herd are provided, as well as for dairy production and fattening - production of meat. The effect of year and season of calving on age at first conception, duration of pregnancy duration of service period, interval between calving, etc. is investigated in the paper. Bull dams of Simmental breed selected on farms of individual agricultural producers were investigated. The method of Least Squares LSMLMW(Harvey 1987) was used for analysis of the effect of year and season of calving on reproductive traits. Year of calving had significant effect on duration of service period and interval between calving (p<0.05), while season influenced significantly only the duration of service period (p<0.05). Mean values of the general average were following: for age at first conception - 517.61 days; duration of pregnancy 285.51 days; duration of service period 108.98 days; duration of interval between calving 395.34 days.

scholarly journals Investigation of the effect of certain paragenetic factors on fertility traits of bull dams of Simmental breed

2005 ◽  
Vol 21 (3-4) ◽  
pp. 35-41 ◽  
Author(s):  
Vlada Pantelic ◽  
Zlatko Skalicki ◽  
D. Latinovic ◽  
Milan Petrovic ◽  
Denis Kucevic
Keyword(s):  
Least Squares ◽  
Reproductive Traits ◽  
Objective Evaluation ◽  
Agricultural Producers ◽  
Mean Values ◽  
Service Period ◽  
General Average ◽  
The Republic ◽  
Fertility Traits ◽  
Duration Of Pregnancy

Investigation included bull dams of Simmental breed selected on farms of agricultural producers on the territory of the Republic of Serbia. Method of Least Squares - LSMLMW (Harvey 1987) was used for analysis of the effect of region and order of lactation on reproductive traits. Obtained results indicate the justification for investigation of paragenetic factors, since the knowledge of their effect can contribute to more objective evaluation of random effects. Regions had highly significant effect (P<0,01) on age at first conception, duration of service period and interval between calvings whereas no significant effect on duration of pregnancy was registered (p>0.05). The effect of region of breeding many factors are included and most important one is nutrition. Order of lactation as second factor investigated in this research had no effect on any of the fertility traits (p>0.05). General average of mean values of least squares for fertility was: for age at first conception 517.61 days, duration of pregnancy 285.51 days, duration of service period 108.98 days, interval between calving 395.34 days.

scholarly journals The influence of age at first fertilization on some reproductive and performance traits of Simmental cows in first three lactations

2002 ◽  
Vol 18 (1-2) ◽  
pp. 17-22 ◽  
Author(s):  
Predrag Perisic ◽  
Zlatko Skalicki ◽  
Milan Petrovic
Keyword(s):  
Statistical Analysis ◽  
Milk Fat ◽  
Reproductive Traits ◽  
Negative Deviation ◽  
Method Of Least Squares ◽  
Service Period ◽  
Performance Traits ◽  
General Average ◽  
And Performance ◽  
Effect Of Age

Certain reproductive and performance traits of Simmental cows, as well as the demonstration of those traits depending on the effect of age at first fertilization, were investigated. The investigation included 606 cows, divided according to age at first fertilization, in 10 groups (one month difference among groups). Statistical analysis of data was done by method of Least squares (LSMLMW, Harvey, 1989), the model with fixed influence of factors on observed traits was applied. Established results have shown that the age of head of cattle at first fertilization had highly significant effect (P<0,01) on the occurrence of deviation from the general average in the first service period and also on the weight of calves at first calving. At the second and third calving, the deviations from the general average in investigated reproductive traits were within the limits of random. In regard to the demonstration of performance traits, the effect of age at first fertilization was most expressive in first lactation. The greatest negative deviation from the general average in milk yield and yield of milk fat, were established in first calving cows which were the youngest at fertilization-calving. The increase of age at first fertilization induced the less negative deviations from the general average. In the second and third lactation, deviation from the general average depending on the age at first fertilization, expressed the same trend, but within the limits of random deviations (P>0,05).

scholarly journals Sustainability and typology of dairy production systems

2018 ◽  
Vol 39 (5) ◽  
pp. 2081
Author(s):  
Kellen Cristina Kuwahara ◽  
Julio Cesar Damasceno ◽  
Ferenc Istvan Bánkuti ◽  
Rodrigo César Prizon ◽  
Diogo Francisco Rossoni ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Production Systems ◽  
Common Factor ◽  
Dairy Production ◽  
Agricultural Producers ◽  
Mean Values ◽  
Rural Workers ◽  
Survival Capacity ◽  
Cluster 2

The objective of this study is to analyze the typology of dairy production systems (DPS) in Paraná, Brazil, based on sustainable practices adopted by agricultural producers. A total of 153 semi-structured questionnaires containing variables for general characterization of DPS, socioeconomic characteristics of farmers, as well as environmental, social, and economic sustainability actions implemented by rural workers were applied. Common factor analysis (CFA) was used to evaluate sustainability variables. Three factors were created: economic (F1), social (F2), and environmental (F3). Hierarchical clusters were formed using the factor scores obtained in CFA. Three clusters were defined and were compared with F1, F2, and F3. There were significant differences in F1 and F2 between clusters 1, 2, and 3. Cluster 1 contained DPS highly compliant with economic, social, and environmental sustainability practices. Cluster 2 was defined by DPS with negative mean values for all three factors. Cluster 3 contained DPS that were highly compliant with F1 and F2 activities compared to cluster 2 and poorly compliant with F1 and F2 actions compared to cluster 1. Therefore, the DPS in Paraná vary according to the sustainable activities implemented by farm managers. In addition, most analyzed DPS have low survival capacity in the medium- and long-term. The most critical sustainability factor was F3, followed by F2 and F1.

scholarly journals Inheritance of some fertility traits in three successive generations of Holstein-Friesian cattle

2005 ◽  
Vol 48 (1) ◽  
pp. 5-11
Author(s):  
R. Lazarevic ◽  
B. Miscevic
Keyword(s):  
Reproductive Traits ◽  
Service Period ◽  
Holstein Friesian ◽  
Successive Generations ◽  
Fertility Traits ◽  
Friesian Cattle ◽  
Duration Of Pregnancy

Abstract. The aim of the paper was to establish reproductive traits and their heritability during the three successive generations of Holstein-Friesian cattle. Research was conducted on the duration of pregnancy, service period and fertility intensity. In each generation there were 135 first calved cows. Service period and fertility intensity refers to the following calving. Significant differences were established (P < 0.05) regarding duration of pregnancy between I and II generation. Significant (P < 0.05) influence of season on duration of pregnancy and service period was established in I generation (1991), on duration of service period and fertility intensity in II generation (1996) and on duration of pregnancy and service period in III generation (2000). Season effect (summer) was established for all traits of fertility in II generation (P < 0.05). The season (spring) had influence on duration of pregnancy (P < 0.05) and summer had an influence on duration of service period and fertility intensity, and winter effected the duration of service period (P < 0.05) in III generation. Values of heritability coefficients are pretty low for all generations. Considerably greater values for heritability were established for service period and intensity of fertility of cows per generations.

scholarly journals The effect of breeding region on certain fertility parameters of Simmental cows

2008 ◽  
Vol 24 (3-4) ◽  
pp. 1-8 ◽  
Author(s):  
Vlada Pantelic ◽  
Z. Skalicki ◽  
M.M. Petrovic ◽  
S. Aleksic ◽  
D. Ostojic-Andric ◽  
...  
Keyword(s):  
Least Squares ◽  
Method Of Least Squares ◽  
Age At First Calving ◽  
Production Stage ◽  
Service Period ◽  
Cattle Reproduction

Field of cattle reproduction is the most important production stage because it is in this stage that heads of cattle for renewal of herd are provided, also for production of milk and fattening, i.e. production of meat. In this study, the effect of breeding region on variability of age at calving and duration of service period in 3.641 first calving Simmental cows under control, reared on private farms on the territory of Republic of Serbia was investigated. In the analysis of collected data the method of Least Squares was used LSMLMW (Harvey 1990) according to following formula: Ykm = ? + Rk + ekm. Regions had highly significant effect (P<0,01) on age at first calving and duration of service period. Through application of method of Least Squares average service period of 115,19 days and age at first calving of 795,53 days were established.

scholarly journals Phenotypic and genetic parameters of reproductive traits of black and white cows with different share of HF genes

2007 ◽  
Vol 23 (5-6-1) ◽  
pp. 193-199 ◽  
Author(s):  
M.M. Petrovic ◽  
S. Aleksic ◽  
T. Smiljakovic ◽  
V. Pantelic ◽  
D. Ostojic-Andric
Keyword(s):  
Genetic Parameters ◽  
Mixed Model ◽  
Reproductive Traits ◽  
Genetic Group ◽  
Milk Traits ◽  
Black And White ◽  
Service Period ◽  
White Breed ◽  
General Average ◽  
Fertility Traits

In this paper, results of the effect of direct and indirect selection of quantitative fertility traits of cattle end heritability level are presented. Study of the quantitative genetic parameters was carried out on three large farms of Black and White, Holstein-Friesian cattle. Investigation included 3900 first calving cows, daughters of 54 bull sires. The effect of genetic group of the head of cattle (genotype) and of the herd on fertility and milk traits of heifers and first calving cows of Black and White breed was investigated. Genetic group of the head of cattle (genotype) had no significant effect in variation of the fertility traits compared to general average (P<0.01). The effect of herd caused statistically significant and highly significant deviation from the general average, P < 0.05 and P < 0.01. Established heritability coefficients for fertility traits had low values for age at insemination (0,112), duration of pregnancy (0,045) and duration of service period (0,097). Results were obtained by applying mathematicalstatistical analysis of data - using mixed model (Harvey, 1990). Mathematical-statistical analysis of data was carried out using linear methods with fixed influence through model of Least Squares (LS method). Genotype of the head of cattle caused no significant deviation of fertility traits (P>0,05).

scholarly journals The effect of the level of milk yield on the reproduction traits in black and white cows

2012 ◽  
Vol 28 (3) ◽  
pp. 487-496 ◽  
Author(s):  
R. Djedovic ◽  
V. Bogdanovic ◽  
G. Trifunovic ◽  
M.D. Petrovic ◽  
M.M. Petrovic ◽  
...  
Keyword(s):  
Birth Weight ◽  
Milk Yield ◽  
Calving Interval ◽  
Mean Values ◽  
Black And White ◽  
Service Period ◽  
Holstein Friesian ◽  
Reproduction Traits ◽  
General Average ◽  
The Relationship

In this study a relationship between the milk yield and following reproduction traits: number of inseminations per conception [AIS], service period [SP], age at calving [AC], calving interval [CI] and birth weight [BW] is studied. The research involved dairy cows of European type of Black and White cattle which are being intensively improved by the genes of Holstein - Friesian breed. Mean values of general average for number of inseminations per conception, service period, age at calving, calving interval and birth weight are: 2.00; 98.78; 1088.08; 376.70 and 36.40, respectively. In general, the estimated phenotypic correlations (rp) between the milk yield over standard lactations and fertility traits were positive and unfavorable, and ranged from 0.24 for the relationship between milk yield and birth weight to 0.70 for relationship between milk yield and age at calving.

scholarly journals COMBINING ABILITY EFFECTS AND PER-SE PERFORMANCES OF MORPHO REPRODUCTIVE TRAITS IN RICE (Oryza sativa L.)

2015 ◽  
Vol 26 (2) ◽  
pp. 23-32
Author(s):  
M. A. Islam ◽  
M. A. K. Mian ◽  
M. G. Rasul ◽  
Q. A. Khaliq ◽  
M. K. Bashar
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Plant Breeding ◽  
Plant Height ◽  
Combining Ability ◽  
Oryza Sativa L ◽  
Reproductive Traits ◽  
Negative Effects ◽  
Mean Values ◽  
Per Se

To study combining ability effects of developed CMS and restorer lines an experiment was carried out at the experimental farm, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur during Aman 2011 and Boro 2011-12 following RCBD design through line × tester analysis in three replications. Five known CMS lines and sixteen developed Restorer lines were considered for through line × tester analysis. Among sixteen restorer lines, only four showed significant negative GCA effects for all these three traits for earliness. The estimated of gca effects of parents indicated that seven parents and sixteen crosses contributed highly significant negative effects for plant height which were responsible for dwarfing character. Fifteen crosses and eight parents showed significant negative sca estimates for days to first flowering and twenty crosses for maturity. Considering both SCA effects and per se performances for days to 1st flowering and maturity; the crosses of IR 58025A with RG-BU08-005R, RG-BU08-006R, RG-BU08-016R, RG-BU08-018R and RG-BU08-025R were found as the best specific combiner. Among 80 crosses fifty two crosses showed significant positive SCA effects along with above average perse performances for grain yield. Ten crosses of IR 58025A, seven crosses of GAN46A, fourteen crosses of IR 62829A, nine crosses of IR 68888A and ten crosses of BRRI 1A showed significant positive SCA effects along with mean values resulting significant positive SCA effects and above average perse performances with all five CMS lines for grain yield.

scholarly journals Influence of heat stress on the reproduction rates of sows of the Poltava meat breed, depending on the genotype

2022 ◽  
Vol 42 ◽  
pp. 01026
Author(s):  
Natal`ya Garskaya ◽  
Lidiya Peretyatko ◽  
Sergey Pozyabin ◽  
Sergey Tresnitskiy ◽  
Anatoliy Tresnitskiy
Keyword(s):  
Heat Stress ◽  
Blood Content ◽  
Group I ◽  
Service Period ◽  
Early Maturing ◽  
Group Ii ◽  
Duration Of Pregnancy

The article deals with the issues of the influence of heat stress that occurs in the summer on the indicators characterizing the reproductive qualities. Purebred sows of tested Poltava meat breed of different genotypes were investigated: Group I - individuals-offspring obtained by the method of introductory crossing using the blood of early maturing meat breed (blood content 12.5 %), Group II - individuals obtained by the method of introductory crossing using the blood of the Finnish Landrace (blood content of 12.5 %). It was found that in sows of the Poltava meat breed with the blood of early maturing meat breed, the number of live piglets at birth significantly exceeds the indices of sows with the blood of the Finnish Landrace by 8.27 % at p≤0.05. According to the analysis of Cv, these natural and technological conditions had the greatest influence on the duration of the service period in sows of Group I. Wherein, the least influence of these natural and technological conditions was found for the indicator of the duration of pregnancy. Animals with the blood of an early maturing meat breed were more adaptable to these natural and technological conditions.

scholarly journals Phenotypic correlations of productive and reproductive traits of Simmental cows

2007 ◽  
Vol 23 (3-4) ◽  
pp. 11-17
Author(s):  
Vlada Pantelic ◽  
Z. Skalicki ◽  
M.M. Petrovic ◽  
S. Aleksic ◽  
B. Miscevic ◽  
...  
Keyword(s):  
Milk Fat ◽  
Reproductive Traits ◽  
Phenotypic Correlation ◽  
Cattle Breeding ◽  
Phenotypic Correlations ◽  
Service Period ◽  
Calving Season ◽  
The Republic ◽  
One Year ◽  
Fertility Traits

Research included 3.461 first calving Simmental cows in control, with lactations concluded within one year. All first calving cows were reared by private/individual farmers on the territory of the Republic of Serbia. Phenotypic correlations between following milk and fertility traits have been investigated: duration of lactation DL, milk yield MY, milk fat content MFC, milk fat yield MFY, yield of 4% FCM, age at first calving AFC and duration of service period DSP. Results of the investigation of phenotypic correlations are obtained using mixed models LSMLMW (Harvey 1990). This method enables optimal consideration of numerous effects on investigated traits (bull sires, region, calving season, and calving year). Phenotypic correlation of traits in cattle breeding relates to presence of mutual positive or negative covariance which is result of the effect of genetic and factors of the environment. Information on phenotypic correlations between milk and fertility traits can be of great importance in selection of cows, since it provides possibility to choose/select heads based on several traits at the same time. .

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