Metabolizable energy (ME) required for lactation of bitches and for growth of puppies were estimated using healthy Beagle dams (n = 9) and their puppies (n = 29). A dam was housed with her puppies in a special cage, and the dam and puppies were allowed to free access to dry food containing 3.69 kcal of ME/g dry matter. The puppies began to ingest food from wk 5 after birth, and were weaned from their dams by the end of wk 8. The body weight of dams decreased to 94% of that just after parturition in the first 2 wk, but recovered in the next 2 wk, and then gradually increased to 104% until weaning. The ME required for lactation widely varied with suckled litter size. When puppies received only dam's milk during the first 4 wk after birth, the ME required for lactation was 318kcal/Wp0.75 per day, where Wp is the body weight of puppies in kilograms, although it was more e asobtained by 302 kcal/d per puppy for Beagles. After puppies began to ingest dry food, the value decreased from 307 kcal/W/p^0.75 per day during wk 5 to 168 kcal/Wp^0.75 per day immediately before weaning, but was roughly 462 kcal/d per puppy for Beagles during this period. Conversely, ME intake of a puppy increased from 229 to 283 kcal/Wp0.75 per day during the suckling period for 8 wk, but was maintained at an almost constant level of 271 kcal/Wp^0.75 per day for 9 wk after weaning.

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モルモットにおける飼料の嗜好性を様々な観点から検討した。粉餌とサイズの異なる3つのペレット間の選択性を調べたところ,モルモットは粉餌に比してペレットを好むがペレットの大きさははっきりと識別できなかった。次に匂いの嗜好性テストを,市販モルモット用ペレット飼料,キャベツ,レタス,ナシおよび煮干しの間で行ったところ,市販モルモット用ペレット飼料に対し強い興味を示した。市販モルモット用ペレット飼料を除く4品目について食選択性を検討したところ,煮干しを最も好んで食べた。アスコルビン酸(ビタミンC)に対する嗜好性を,アスコルビン酸欠乏飼料ならびにアスコルビン酸添加飼料(0.5または1mg/g飼料)の間で調査したが,モルモットはアスコルビン酸添加飼料に対する強い選択性を示さなかった,色に対する嗜好性を確認するために,白色と緑色の飼料で比較したが明らかな差は見いだされなかった。
以上の結果より,モルモットには味や匂いに対する嗜好性が一部存在するものと推察された。

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