Collinearity as a problem in predicting body weight from body dimensions of Najdi sheep in Saudi Arabia

Body weight and seven body dimensions measuring the length, height, width and depth were taken at birth and every 180 days up to 720 days of age on 49 pure Canadian, 49 first cross of 1/2 Brown Swiss 1/2 Canadian, and 30 backcross of 1/4 Brown Swiss 3/4 Canadian heifers. The animals were raised up to 180 days of age at the Deschambault Station, then half the pure Canadian and the first cross were transferred to the La Pocatière Station. At birth, the pure Canadian calves weighed 29.2 kg and were lighter than the first and backcrosses by 6.9 kg (24%) and 4.8 kg (16%), respectively. The two crosses exceeded the pure Canadian in all the dimensions, the differences being significant in height at shoulder and width at rumps. At 360 days of age the two crosses were about 6% heavier and 4% higher at shoulder than the pure Canadian. With the exception of body length after 1 yr of age in which the backcross was slightly inferior to the pure Canadian, the two crosses were generally larger than the pure Canadian, with the backcross being intermediate between the first cross and the pure Canadian. The effects of season of birth and age of dam were found to be non-significant on most of the traits studied in this experiment.

Download Full-text

Determining the Relationship between Body Weight and Body Dimensions in Adult Domestic Cavy, Using Principal Component Analysis

10.9734/bpi/raavs/v4/2726e ◽

2021 ◽

pp. 42-51

Author(s):

T. E. Zetang ◽

O. M. Momoh ◽

P. A. Addass ◽

M. E. Khan

Keyword(s):

Principal Component Analysis ◽

Body Weight ◽

Principal Component ◽

Component Analysis ◽

Body Dimensions ◽

The Relationship

Download Full-text

Back Pain and Schoolbags among Adolescents in Abha City, Southwestern Saudi Arabia

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17010005 ◽

2019 ◽

Vol 17 (1) ◽

pp. 5 ◽

Cited By ~ 1

Author(s):

Abdullah Assiri ◽

Ahmed A. Mahfouz ◽

Nabil J. Awadalla ◽

Ahmed Y. Abolyazid ◽

Medhat Shalaby

Keyword(s):

Saudi Arabia ◽

Body Weight ◽

Back Pain ◽

Secondary School ◽

Weight Percent ◽

Cross Sectional Study ◽

Student Body ◽

Cross Sectional ◽

Anonymous Questionnaire ◽

Significant Factors

The incorrect carriage of schoolbags and heavy bags may result in back pain (BP) in adolescents. Our objective was to assess the problem of BP and associated factors among adolescents. This was a cross-sectional study targeting intermediate and secondary school adolescents in Abha City, Saudi Arabia. An anonymous questionnaire for BP was used. Student body weight and the weight of their full schoolbag were measured. The study included 876 adolescents. An overall prevalence of BP of 39.4% (95% CI: 35.3–43.7) was found. Upper BP (UBP), middle BP (MBP), and lower BP (LBP) amounted to 14.5%, 13.4%, and 11.5%, respectively. Associated significant factors with MBP were carrying the bag on one side compared to on the back (adjusted odds ratio (aOR) = 2.13, 95% CI: 1.20–3.73) and being at intermediate level compared to secondary (aOR = 1.56, 95% CI: 1.04–2.40). On the other hand, gender and schoolbag weight/body weight percent were not found to be significantly associated with MBP. None of the studied factors were significantly associated with overall BP, UBP, or LBP. BP is a prevalent among adolescents in southwest Saudi Arabia. One-sided schoolbag carriage is a significant associated factor for middle back pain. Parents and teachers should encourage students to consider the correct way to carry schoolbag.

Download Full-text