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Bahashwan S.,Salalah Livestock Research Station | Alrawas A.S.,Salalah Livestock Research Station | Alfadli S.,Salalah Livestock Research Station | Johnson E.S.,Oklahoma Panhandle State University
Livestock Research for Rural Development | Year: 2015

Dhofari cattle growth curve was estimated and fitted using non-linear function models of Gompertz, Von Bertalanffy and Logistic. Data of 2540 weight performances of 617 Dhofari cattle from birth to 228 months of age were used in this study. Analysis revealed an initial average live birth weight of 17.8±0.99kg and of 360±23.6kg at an average age of 228 months. The estimated values of A (mature body weight) parameter ranged from 316 to 321 kg at ages ranged from 36 to 48 months. Parameters of b and k were estimated to be 2.11±0.021 and, 0.106±0.002, 0.522±0.004 and, 0.087±0.001, and 20.5±0.001 and, 0.127±0.002, for Gompertz, Von Bertalanffy, and Logistic models respectively. Inflection weights and time were found to range from 95 to 158 kg, and 5 to 9 months of age respectively. Degree of maturity (Ut) at birth was 5.59, 8.99, 12.8%, and at puberty was 36.8, 26.6, and 44.0% for Gompertz, Von Bertalanffy, and Logistic, respectively. Models used to fit the growth curve had high determination coefficients above 92% with the highest was for Von Bertalanffy (93.6%) for goodness of fit. © 2015, Fundacion CIPAV. All rights reserved.


Bahashwan S.,Salalah Livestock Research Station | Alfadli S.,Salalah Livestock Research Station
Livestock Research for Rural Development | Year: 2016

Data of 224 Dhofari cows for weight at birth, udder score and body condition score with their relative offspring periodical weight from birth to 105-day weaning age were used in this study. The objective of this research was to find out the effect of dams weight at birth, udder score and body condition score on calves birth weight and pre-weaning daily gain. Dam were classified according to their weights at parturitions into high (>400 kg), medium (300 to 400 kg) and, low (<300 kg). Dams udder characteristics were scored in a scale of 1 to 7 (1= udder have small teats and well attached and 7= minimum one udder quarter is not working) and dams body condition was scored in a scale of 1 to 5 (1=very thin and 5=very fat). Analyses showed that dams body weight class at parturition had a significant (p<0.05) effect on calves birth weight and pre-weaning daily growth as heavier cows gave birth to heavier calves with higher pre-weaning growth rates and vice versa. There was a positive significant (p<0.05) correlation between dams weight at parturition and birth weight, and high positive significant (p<0.01) correlation between dams body weight at parturition and calves weight at 60-day age. Dams udder score had a significant (p<0.05) effect on calves birth weight, 60-day age weight, and daily growth from birth to 60-day old weight but not on any other weights or growth rates investigated. In general, results revealed that cows with udder score of 3(large teats and well attached udder) resulted in higher calves pre-weaning growth rates than the others. The only significant (p<0.01) effect of dams body condition score at parturition was on calves daily gain from birth to 60-day old. Duncan test showed that cows that had body condition score between 2 to 3 had higher growth rates than the other cows. This study recommends that in order to get higher calves weights and growth rates, cows should possess body score conditions from 2 to 3, have large teats with well attached udder, and average weigh from 300 to 400 kg for the Dhofari cattle breed. © 2016, Fundacion CIPAV. All rights reserved.


Bahashwan S.,Salalah Livestock Research Station
Livestock Research for Rural Development | Year: 2016

Objective of this study was to find out the effect of season(SN), sex, dam age, body condition score(BCS), dam weight at partition, lactation period(LP), and dam milk yield(MY) on the 105-day weaning weight (WW) of Dhofari calves breed. Data of 180 calves (86 males and 94 females) born between 2010 and 2014 were obtained from Salalah livestock research station of Sultanate of Oman. The overall mean of the 105-day weaning weight of all calves was 94.6 ±1.07 kg. General linear model (GLM) analysis(ANOVA) showed that season, sex, dam age, body condition score, lactation period, dam weight, and dam milk yield had significant (p<0.05) effects on calves weaning weight. Calves weaned at winter season gave highest values with an average of 98.9 ±1.87 kg. Cows from 7 to 10 years old gave the highest weaning weights (99.3 ±3.15 kg). Cows with BCS of 3 to 4 gave highest WW, and males (97.1 ±2.00 kg) were higher than females. Cows that produced above 9 kg/day/head, and their lactation period lasted more than 230 days got highest WW of 99.1± 2.69 kg, and 98.8 ±3.89 kg, respectively. © 2016, Fundacion CIPAV. All rights reserved.


Bahashwan S.,Salalah Livestock Research Station | Alrawas A.S.,Salalah Livestock Research Station | Alfadli S.,Salalah Livestock Research Station
Asian Journal of Animal Sciences | Year: 2015

The present study was carried out to find the effect of sire birth weight on the Dhofari calf’s breed growth traits of birth weight, weaning weight, yearling weight, pre-weaning, post-weaning daily gain, dam gestation length and calving ease score. Seasonal interaction with the sire birth weight effect on calf’s growth traits was also investigated. Growth traits of calf’s were classified to seasonal (cold, hot and temperate) interaction with sire birth weight class. Data of different weight records of 558 calf’s’ and their relative dams sired by 40 Dhofari bulls breed from Salalah Livestock Research Station were used in this study. The different calf’s growth traits were classified into three classes according to sire birth weights (high, medium and low). The data were analyzed by multivariate General Linear Model (GLM) using SPSS. Analysis showed significant (p<0.05) effect of sire birth weight class on all calf’s growth traits. Calf’s of high class sire birth weights proved to be heavier for all growth traits than sired by medium and low class bulls. There was a strong positive significant (p<0.01) correlation between sire birth weight class and all calf’s growth traits with the highest being with calf’s birth weight. The interaction between season and sire birth weight class showed significant (p<0.05) effect on calf’s pre-weaning and post weaning daily gain during the temperate season but none (p>0.05) for the other growth traits of birth weight, weaning weight and yearling weight. Heavier calf’s sired by high sire birth class had a significant (p<0.05) longer dam gestation length than those of low class sire birth weights. There was a significant (p<0.05) correlation between sire birth weight class and gestation length of the dam. However, there was no significant (p>0.05) effect of calf’s sex on the dams gestation length. Analysis showed that dams sired by high sire birth weight class had heavier calf’s and this had a significant (p<0.05) effect on the dams calving ease of score in comparison to dams sired by medium and low sire birth classes. © 2015 Knowledgia Review, Malaysia.

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