哺乳期子牛の水分出納, 糸球体濾過量, および尿細管からの水の再吸収に及ぼす代用乳と固形飼料の影響 Effect of Milk Replacer and Solid Feed on Water Balance, Glomerular Filtration Rate, and Reabsorption of Water from Renal Tubules in Suckling Calves

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1週齢ホルスタイン種雄子牛20頭ずつを用い,試験1では哺乳期間中の代用乳給与日量(500vs.200g)と1週目からの固形飼料(チモシー乾草と市販スターター)の不断給与または無給与が2週目の水分出納に及ぼす影響,試験2では2週目における糸球体濾過量(GFR)と尿細管からの水の再吸収率(RAOW)に及ぼす影響を調べた.試験1では代用乳懸濁用温水,摂取固形飼料•代用乳中水分の合計量と,尿および糞中水分の合計量との差を見かけの水分保持量(AWR)とした.1週目からの固形飼料の給与は代用乳量に関係なく2週間以内に尿量を減少させる一方,糞中水分排泄量を増加させ,糞水分含量も固形飼料無給与区の68-69%から76-77%に上昇した.しかしAWRは固形飼料の給与のみならず代用乳の増量によっても増加した.試験2の結果,固形飼料の給与による尿量の減少は,GFRの増加にもかかわらず尿細管からの水の再吸収率が増加したためであることが示唆された.

Two trials were conducted using Holstein bull calves purchased from a market at 1wk of age. In trial 1, 20 calves were used to examine the effect on water balance and fecal moisture content during wk 2 of daily amounts of milk replacer (500vs. 200g/d) with or without free access to solid feed (timothy hay and concentrate) from wk 1. In trial 2, the other 20 calves were used to examine the effect of the similar treatments on glomerular filtration rate (GFR) and reabsorption of water (RAOW) from renal tubules during wk 2. Both trials were conducted in a factorial arrangement by dividing 20 calves into 4 groups of 5 calves each. When water balance was determined in trial 1, difference of the sum of urine volume and fecal water excretion from the sum of water used to prepare liquid milk replacer, and moisture originally contained in dry milk replacer and ingested solid feed was designated as apparent water retention (AWR), because metabolic water and evaporation from the lung and body surface were not considered. Ingestion of solid feed and a larger amount of milk replacer resulted in a decrease in urine volume and an increase in fecal water excretion, independent of the amounts of milk replacer. Fecal moisture content also increased from 66-67% in calves received no solid feed to 76-77% in calves given solid feed from wk 1, independent of daily amounts of milk replacer. However, AWR was increased not only by the ingestion of solid feed but also by the larger amount of milk replacer. Results of trial 2 suggested that decrease in urine volume resulting from ingestion of solid feed was due to enhanced RAOW which occurred in spite of an increase in GFR.

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  • 日本畜産學會報 = The Japanese journal of zootechnical science  

    日本畜産學會報 = The Japanese journal of zootechnical science 69(1), 46-52, 1998-01-25 

    Japanese Society of Animal Science

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各種コード

  • NII論文ID(NAID)
    10021727045
  • NII書誌ID(NCID)
    AN00195188
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    1346907X
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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