Growth performance of Brahman and Charolais × Brahman cattle in a tropical environment

1975 ◽  
Vol 15 (73) ◽  
pp. 156 ◽  
Author(s):  
TH Rudder ◽  
GW Seifert ◽  
KG Bean
Keyword(s):  
Growth Performance ◽  
Least Squares ◽  
Least Squares Method ◽  
Tropical Environment ◽  
High Grade ◽  
Primary Reason ◽  
Commercial Property ◽  
Brahman Cattle

Weight per day of age at weaning (175 days) and at 553 days, and post-weaning gain were collected from 159 high grade Brahman and 35 Charolais x Brahman crossbreds on a commercial property in Central Queensland and analysed by the least squares method. The primary reason was to measure the effect of Charolais infusion on high grade Brahman cattle. CharolaisxBrahman cattle were 0.280 kg and 0.168 kg heavier per day of age at weaning and 553 days respectively, and gained 0.126 kg day-1 more during the post-weaning period than the Brahmans (all P < 0.005). Older dams weaned heavier calves than younger dams (P < 0.01), but the differences were non-significant at 553 days and for post-weaning gain. Males were significantly heavier per day of age at weaning and 553 days, and gained more during the post-weaning period. The regression on day of birth was highly significant (P < 0.005) for weight per day of age at 175 days, but not at 553 days.

Factors affecting weaning weight of beef cattle in a tropical environment

1974 ◽  
Vol 14 (68) ◽  
pp. 277 ◽  
Author(s):  
GW Seifert ◽  
TH Rudder ◽  
JW Lapworth
Keyword(s):  
Beef Cattle ◽  
Least Squares ◽  
Least Squares Method ◽  
Tropical Environment ◽  
High Grade ◽  
Weaning Weight ◽  
Factors Affecting ◽  
Commercial Property

Age corrected weaning weights from a commercial property in central Queensland were analysed by the least-squares method. The breeder herd composition varied from low to high grade Brahman cross cows, and Belmont Red, Brahman, Droughtmaster, Hereford and Santa Gertrudis bulls were used in a rotational crossbreeding programme. Age of dam had the largest effect on weaning weight. Cows 11 years and older, produced calves 36 kg heavier than 2-year-old cows. Breed of sire effects were highly significant (P < 0.005), with the Belmont Red sired calves being heavier than Brahman, Hereford, Santa Gertrudis and Droughtmaster sired calves. Day of birth had a significant effect on weaning weight representing an extra 0.14 � 0.04 kg per day of age. Over the whole group, heifer calves were 4.2 per cent lighter than steers, but this varied according to the breed of sire ranging from 9.6 to -0.5 per cent.

‘Least squares’ method—theorem or law?

1980 ◽  
Vol 59 (9) ◽  
pp. 8
Author(s):  
D.E. Turnbull
Keyword(s):  
Least Squares ◽  
Least Squares Method

An Augmented Iteratively Re-weighted and Refined Least Squares Method for lp Minimization Problem in Inverse Modeling of Potential Field Magnetic Data

2020 ◽  
Vol 1 (3) ◽  
Author(s):  
Maysam Abedi
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Least Squares ◽  
Minimization Problem ◽  
Potential Field ◽  
Field Data ◽  
Least Squares Method ◽  
Porphyry Copper ◽  
Magnetic Data ◽  
Magnetic Field Data

The presented work examines application of an Augmented Iteratively Re-weighted and Refined Least Squares method (AIRRLS) to construct a 3D magnetic susceptibility property from potential field magnetic anomalies. This algorithm replaces an lp minimization problem by a sequence of weighted linear systems in which the retrieved magnetic susceptibility model is successively converged to an optimum solution, while the regularization parameter is the stopping iteration numbers. To avoid the natural tendency of causative magnetic sources to concentrate at shallow depth, a prior depth weighting function is incorporated in the original formulation of the objective function. The speed of lp minimization problem is increased by inserting a pre-conditioner conjugate gradient method (PCCG) to solve the central system of equation in cases of large scale magnetic field data. It is assumed that there is no remanent magnetization since this study focuses on inversion of a geological structure with low magnetic susceptibility property. The method is applied on a multi-source noise-corrupted synthetic magnetic field data to demonstrate its suitability for 3D inversion, and then is applied to a real data pertaining to a geologically plausible porphyry copper unit.  The real case study located in  Semnan province of  Iran  consists  of  an arc-shaped  porphyry  andesite  covered  by  sedimentary  units  which  may  have  potential  of  mineral  occurrences, especially  porphyry copper. It is demonstrated that such structure extends down at depth, and consequently exploratory drilling is highly recommended for acquiring more pieces of information about its potential for ore-bearing mineralization.

Theoretical accuracy of the last squares method in the isotope dilution analysis

1984 ◽  
Vol 49 (4) ◽  
pp. 805-820
Author(s):  
Ján Klas
Keyword(s):  
Least Squares ◽  
Isotope Dilution ◽  
Least Squares Method ◽  
Isotope Dilution Analysis ◽  
Straight Line ◽  
The One ◽  
Two Parameter ◽  
Theoretical Accuracy

The accuracy of the least squares method in the isotope dilution analysis is studied using two models, viz a model of a two-parameter straight line and a model of a one-parameter straight line.The equations for the direct and the inverse isotope dilution methods are transformed into linear coordinates, and the intercept and slope of the two-parameter straight line and the slope of the one-parameter straight line are evaluated and treated.

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