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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/8991

Title: Effects of dietary intake level and seasonal ambient temperature on growth rate in growing Najdi lambs
Authors: A. N. Al-Owaimer
A. A. Al-Haidary
M. A. Abouheif
Issue Date: 1428
Abstract: : A total of twenty-four Najdi ram lambs were utilized to study the effect of dietary intake level and body weight on performance and core body temperature under the prevailing winter and summer months of Saudi Arabia. Each lamb was implanted with telemetric temperature transmitter to monitor the changes in core temperature. Lambs within each season (12 lambs) were randomly allocated to three dietary intake levels with four lambs per level; the dietary intake levels were: low, 55; medium, 68 and high, 81 g DM per w0.75.day. Feeding trials were executed when the lambs attained 25-, 35- and 45-kg average body weight; all lambs were individually fed throughout the 3 weeks of feeding trials. There was no significant (P>0.05) effect of season on the performance of 25-kg lambs. When the body weight of winter-raised lambs increased to 35 kg, lambs fed medium and high levels of DMI gained 4.6 and 22.9% more (P<0.05) average daily weight and had 6.3 and 17.2% less feed to gain ratio (P<0.05), respectively, than those lambs in summer months. Winter-raised lambs fed low, medium and high levels of DMI grew 5, 35.1 and 31.3% faster (P<0.05) and were 6.4, 25.5 and 23.7% more efficient (P<0.05) in converting feed into gain, respectively, than those comparable 45-kg lambs in summer months. Generally, increasing the level of daily DMI were coincided with significant increases (P<0.05) in ADG and feed efficiency in all studied weight categories. Average core body temperatures were elevated (P<0.05) by 0.19, 0.12 and 0.13°C in 25-, 35- and 45-kg lambs subjected to summer environments, respectively, than those in winter months. Increasing level of dietary intake was accompanied by a parallel increases (P<0.05) in core body temperature in all weight categories of lambs
URI: http://hdl.handle.net/123456789/8991
Appears in Collections:College of Foods And Agricultural Science

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