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 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.

Genetic analysis of reproductive Traits of Tharparker cattle at organized farms in Rajasthan

2017 ◽  
Author(s):  
Geetesh Mishra ◽  
M. F. Siddiqui ◽  
V. S. Ingle ◽  
R. S. Pal
Keyword(s):  
Least Squares ◽  
Management Practices ◽  
Correlation Coefficients ◽  
Reproductive Traits ◽  
Gestation Period ◽  
Effective Management ◽  
Dry Period ◽  
Age At First Calving ◽  
Service Period ◽  
Tharparkar Cattle

The present study was carried out from the data obtained on the reproduction performance of 95 Tharparkar cattle over the period 1995-2014. The overall least squares mean and standard error for age at first calving, service period, gestation period, dry period and intercalving period were 1769.07± 29.80, 117.53± 2.39, 281.62± 0.37, 105.03 ± 2.09 and 399.97 ± 2.44 days, respectively. The Least Squares Analysis of Variance has revealed that there was a significant effect of sire ( P>0.01) and period (P>0.05) on age at first calving and the service period is significantly influenced by period and parity of the animal .Similarly the gestation period was affected by parity, dry period was affected by period of study and inter calving period was substantially influenced by period and parity of the animal. The observed correlation coefficients among different reproductive traits were significant to highly significant where as the estimates of heritability for the same traits were low to moderate. The significant effect of several non-genetic factors on most of the reproductive traits suggesting that they are low heritable and cannot be improved by conventional selection methods but can only be improved through effective management practices, nutrition, health etc..

The limit state of concrete and reinforced concrete rods at complex and longitudinal-transverse bending

2020 ◽  
pp. 60-73
Author(s):  
Yu V Nemirovskii ◽  
S V Tikhonov
Keyword(s):  
General Solution ◽  
Least Squares ◽  
Nonlinear Differential Equations ◽  
Limit State ◽  
Algebraic Equations ◽  
Method Of Least Squares ◽  
Elasticity Limit ◽  
Limit Values ◽  
Symbolic Calculations ◽  
Deformation Diagrams

The work considers rods with a constant cross-section. The deformation law of each layer of the rod is adopted as an approximation by a polynomial of the second order. The method of determining the coefficients of the indicated polynomial and the limit deformations under compression and tension of the material of each layer is described with the presence of three traditional characteristics: modulus of elasticity, limit stresses at compression and tension. On the basis of deformation diagrams of the concrete grades B10, B30, B50 under tension and compression, these coefficients are determined by the method of least squares. The deformation diagrams of these concrete grades are compared on the basis of the approximations obtained by the limit values and the method of least squares, and it is found that these diagrams approximate quite well the real deformation diagrams at deformations close to the limit. The main problem in this work is to determine if the rod is able withstand the applied loads, before intensive cracking processes in concrete. So as a criterion of the conditional limit state this work adopts the maximum permissible deformation value under tension or compression corresponding to the points of transition to a falling branch on the deformation diagram level in one or more layers of the rod. The Kirchhoff-Lyav classical kinematic hypotheses are assumed to be valid for the rod deformation. The cases of statically determinable and statically indeterminable problems of bend of the rod are considered. It is shown that in the case of statically determinable loadings, the general solution of the problem comes to solving a system of three nonlinear algebraic equations which roots can be obtained with the necessary accuracy using the well-developed methods of computational mathematics. The general solution of the problem for statically indeterminable problems is reduced to obtaining a solution to a system of three nonlinear differential equations for three functions - deformation and curvatures. The Bubnov-Galerkin method is used to approximate the solution of this equation on the segment along the length of the rod, and specific examples of its application to the Maple system of symbolic calculations are considered.

scholarly journals Functional ratings in sports

2020 ◽  
Vol 16 (3) ◽  
pp. 183-191
Author(s):  
Brad Lowery ◽  
Abigail Slater ◽  
Kaison Thies
Keyword(s):  
Least Squares ◽  
Method Of Least Squares ◽  
Sports Teams ◽  
New Model ◽  
College Basketball ◽  
Division 1

AbstractIn this paper, we present a new model for ranking sports teams. Our model uses all scoring data from all games to produce a functional rating by the method of least squares. The functional rating can be interpreted as a team average point differential adjusted for strength of schedule. Using two team’s functional ratings we can predict the expected point differential at any time in the game. We looked at three variations of our model accounting for home-court advantage in different ways. We use the 2018–2019 NCAA Division 1 men’s college basketball season to test the models and determined that home-court advantage is statistically important but does not differ between teams.

scholarly journals Historical Note on the Method of Least Squares

Nature ◽  
1872 ◽  
Vol 6 (136) ◽  
pp. 101-102
Author(s):  
ASAPH HALL
Keyword(s):  
Least Squares ◽  
Historical Note ◽  
Method Of Least Squares

The Method of Least Squares

Nature ◽  
1872 ◽  
Vol 6 (138) ◽  
pp. 140-141
Author(s):  
J. W. L. GLAISHER
Keyword(s):  
Least Squares ◽  
Method Of Least Squares
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