Re: [pyrnet] Protein experiment paper (pano and diet)

["Janice Swenson" <janices@austin.rr.com>]

Hi, there.  You can look up a lot of diet/nurtrition related studies for dogs out at 
http://www.nutrition.org or medline

There's another study on overnutrition versus restricted in giant breed dogs that was 
done about the same time in Germany as the one on protein.  Essentially over 
nutrition contributed to the development of ocd.  Overnutrition in large breeds 
exaggerates the tendency to create osteopenia by increasing the rate of skeletal 
growth and remodeling of the newly formed cancellous bone.  Accelerated rates of 
bone growth and bone remodeling act in concert that are ultimately less stronger 
than smaller breed dogs.  

These were done on protein levels:    

Am J Vet Res. 1990 May;51(5):808-12. Related Articles, Links  

Protein requirements of growing pups fed practical dry-type diets containing mixed-
protein sources.

Case LP, Czarnecki-Maulden GL.

Department of Animal Sciences, University of Illinois, Urbana 61801.

The protein requirement of Pointer pups fed practical diets was assessed in 3 
experiments. Eight-week-old pups required 25.2% protein when fed a combination of 
corn gluten meal, soybean meal, and meat and bone meal for 2 weeks. However, 
when a poor-quality poultry by-product meal was substituted for some of the corn 
gluten meal and meat and bone meal, the requirement increased to 27.5%. This 
increased requirement was explained by decreased digestibility of the poultry by-
product meal diet. Pups fed each of the diets required 18% digestible protein to 
maximize growth rate. Sixteen-week-old pups were more efficient at utilizing the 
experimental diets, requiring only 23% crude protein (17.2% digestible protein) to 
maximize growth rate.

J Nutr. 1982 Oct;112(10):1843-53. Related Articles, Links  

Effects of dietary protein quantity and quality on the growth of dogs and rats.

Burns RA, LeFaivre MH, Milner JA.

The growth of immature beagle dogs and weanling rats fed dietary protein 
concentrations between 0 and 20% were investigated. With lactalbumin as the 
protein source, 8- to 10-week-old dogs exhibited optimal growth when the diet 
supplied between 15 and 20% protein, whereas in older growing dogs (13-17 weeks) 
maximum growth and feed efficiency occurred with 11.7% dietary protein. Growth 
and feed efficiency of weanling rats were calculated to be optimal at 11.5% dietary 
protein. The protein efficiency ratio (PER) calculated during 14 days of feeding a 
10% lactalbumin diet was 3.14 for 8- and 10-week-old dogs, 3.42 for 13- to 17-week-
old dogs and 3.92 for weanling rats. Subsequent experiments examined the 
utilization of casein, soy isolate and wheat gluten by immature dogs and weanling 
rats. When diets contained 10% protein the adjusted PERs of casein, soy and wheat 
gluten were 2.50, 1.26 and -0.43 for the dog and 2.50, 1.60 and 0.34 for the rat, 
respectively. At 7.5% protein the adjusted PERs of casein, soy and wheat gluten 
were 2.50, 1.19 and -3.21 for the dog and 2.50, 1.44 and 0.29 for the rat. Thus, the 
rat can be a useful model for examining the quality of proteins fed to dogs. However, 
by using the rat one may overestimate the value of some low quality proteins.

I can't find it right now where using some other models, rats I think, lowering the 
protein levels slowed the growth curve until reaching the final growth.  

Janice, janices@austin.rr.com
Brooke & Lana (newfs), Sonny (pyr)  
http://home.austin.rr.com/janices
Hutto, TX