The response of laying pullets to abrupt changes in Daylength     

T. R. Morris  S. Fox  R. C. Jennings 《British poultry science》1964,5(2):133-147

  相似文献   

The recovery of laying birds from a period of low protein feeding     

R C Jennings  T R Morris 《British poultry science》1965,6(4):321-326

Laying pullets which had been fed diets containing 7, 8½, 10, 11½, 13 and 14½ per cent crude protein for 10 weeks were returned to a normal diet containing 14½ per cent crude protein. For birds which had received the lowest protein diet, rate of lay improved from about 30 per cent to over 80 per cent in 4 weeks. Egg weight, body weight and food consumption also increased rapidly. In the period from 3 to 20 weeks after restoring a normal diet the pullets which had previously been fed 7 per cent and 8½ per cent crude protein showed a rate of lay and an average egg weight substantially better than that of control birds which had always received the 14½ per cent crude protein diet.

It is concluded that a period of low protein feeding does not impair the subsequent ability of the laying bird to reach normal levels of output. On the contrary, birds which are denied a normal protein intake for a time tend to compensate when returned to normal feeding by laying more eggs and bigger eggs. However, in this experiment, the compensation was not enough to offset the loss in yield incurred during low protein feeding.  相似文献   

The Use of Volatile Anaesthetic Agents in Horses and Farm Animals          下载免费PDF全文

Jennings S 《The Canadian veterinary journal. La revue veterinaire canadienne》1963,4(4):86-98

  相似文献   

The use of thiabendazole in bovine ostertagiasis: treatment of experimental Type I disease     

J Armour  F W Jennings  K S Kirkpatrick  A Malezewski  M Murray  G M Urquhart 《The Veterinary record》1967,80(17):510-514

  相似文献   

Central venous pressure monitoring: a guide to blood volume replacement in the dog     

P B Jennings  R W Anderson  A M Martin 《Journal of the American Veterinary Medical Association》1967,151(10):1283-1293

  相似文献   

What is your neurologic diagnosis? Unilateral otitis externa or media, cerebellar meningioma, and a solitary mammary adenoma     

Clifford C  Jennings D  Maslin WR  Weigand C 《Journal of the American Veterinary Medical Association》2000,216(8):1217-1219

  相似文献   

BIOLOGY AND EXPERIMENTATION     

Jennings HS 《Science (New York, N.Y.)》1926,64(1648):97-105

  相似文献   

Rice breeding and world food production     

Jennings PR 《Science (New York, N.Y.)》1974,186(4169):1085-1088

  相似文献   

The Buttermilk Creek complex and the origins of Clovis at the Debra L. Friedkin site, Texas     

Waters MR  Forman SL  Jennings TA  Nordt LC  Driese SG  Feinberg JM  Keene JL  Halligan J  Lindquist A  Pierson J  Hallmark CT  Collins MB  Wiederhold JE 《Science (New York, N.Y.)》2011,331(6024):1599-1603

Compelling archaeological evidence of an occupation older than Clovis (~12.8 to 13.1 thousand years ago) in North America is present at only a few sites, and the stone tool assemblages from these sites are small and varied. The Debra L. Friedkin site, Texas, contains an assemblage of 15,528 artifacts that define the Buttermilk Creek Complex, which stratigraphically underlies a Clovis assemblage and dates between ~13.2 and 15.5 thousand years ago. The Buttermilk Creek Complex confirms the emerging view that people occupied the Americas before Clovis and provides a large artifact assemblage to explore Clovis origins.  相似文献   

FUNDAMENTAL UNITS IN BIOLOGY     

Jennings HS 《Science (New York, N.Y.)》1936,84(2186):445-450

  相似文献