60 



MASS. EXPERIMENT STATION BULLETIN 216. 



These coefficients have also been published in Bulletin 200. 



The oat hulls contained the following percentages in dry matter: ash 6.37, pro- 

 tein 2.52, fiber 32.66, nitrogen-free extract 57.44, and fat l.OL Fiber and nitrogen- 

 free extract constitute the larger part of the hulls. The total dry matter is about 

 one-third digestible, which places them among the lowest grades of cereal by- 

 products. 



Peanut By-Products. 



A study has been made of three peanut by-products, viz., peanut meal, peanut 

 shells and peanut skins. Peanut meal is the ground residue from the extraction of 

 edible oil or soap oil stock. In the former instance it consists of the ground residue 

 from the kernels only, and is specifically known as peanut oil meal. In the manu- 

 facture of soap-stock oil the whole peanut is extracted, and the ground residue 

 should be known as peanut feed, a product much inferior to the peanut oil meal, 

 due to the admixture of shell and skin. Peanut shells are the ground or unground 

 outer hull of the nut; while peanut skins are the thin, waxy inner coat of the endo- 

 sperm or kernel. 



Analysis. 



Dry 



Matter. 



Nitrogen- 

 free 

 Extract. 



Peanut meal 

 Peanut shells 

 Peanut skins 



5.27 

 3.28 

 3.46 



39.74 

 8.91 

 18.75 



5.09 

 63.16 



8.48 



16.21 

 5.77 

 29.29 



Peanut meal, as indicated by the analysis, is a high-grade protein feed with con- 

 siderably more fat than is contained in most concentrates. The shells are composed 

 of nearly two-thirds fibrous material. The skins contain a reasonable amount of 

 protein and nitrogen-free extract, comparatively little fiber, and a very high per- 

 centage of fat. 



Coefficients of Digestibility. 



(b) Peanut Skins. 



XXV 

 XXV 



.48 negative 49.49 negative 28. 

 8.43 34.93 negative negative 2.70 



Mentzel & Lengerke Landw. Kalender 1922, results of seven single trials with four samples. 



