High-quality feed block or HQFB, is a solid block consisting of molasses

Molasses

Molasses is a viscous by-product of the processing of sugar cane, grapes or sugar beets into sugar. The word molasses comes from the Portuguese word melaço, which ultimately comes from mel, the Latin word for "honey". The quality of molasses depends on the maturity of the sugar cane or sugar beet,...

, non-protein nitrogen (NPN), rumen by-pass protein

Protein

Proteins are biochemical compounds consisting of one or more polypeptides typically folded into a globular or fibrous form, facilitating a biological function. A polypeptide is a single linear polymer chain of amino acids bonded together by peptide bonds between the carboxyl and amino groups of...

 (cassava hay), minerals and lipids. It is provided to livestock ruminants in a manner similar to a salt lick.

HQFB is used for ruminant

Ruminant

A ruminant is a mammal of the order Artiodactyla that digests plant-based food by initially softening it within the animal's first compartment of the stomach, principally through bacterial actions, then regurgitating the semi-digested mass, now known as cud, and chewing it again...

 feeding as a method of improving digestion and to help lactation, reproduction, and weight gain. More details can be searched from AJAS, Asia-Australasian Journal of Animal Sciences.