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Seasonal patterns of nitrogen utilization by pocket gophers,Thomomys bottae

Authors
Journal
Comparative Biochemistry and Physiology Part A Physiology
0300-9629
Publisher
Elsevier
Publication Date
Volume
78
Issue
4
Identifiers
DOI: 10.1016/0300-9629(84)90612-1

Abstract

Abstract 1. 1. Adult pocket gophers, fed diets of natural vegetation in the laboratory during summer and winter, remained in positive N balance in all feeding trials. 2. 2. Nitrogen budgets for free-ranging pocket gophers were calculated and revealed that total N influx exceeded 2400 mg N·dkg −1 day −1 in summer and 2300mg N·kg −1day −1 in winter. 3. 3. Apparent N assimilation was 50 and 53% in summer and winter, respectively, and truly digestible N requirements were ⋍ 680 mg N·kg −1 day −1. 4. 4. These budgets indicate that, in spite of seasonally-changing quality of available forage, pocket gophers remain in positive N balance, due largely to shifts in forage preference with season.

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