Feed Protein Flashcards
methods to asses protein quality in non ruminants
protein efficiency ration
biological value
ideal protein concept
protein efficiency ratio(PER) equation
PER = weight gain(g)/protein consumed(g)
biological value method
the proportion of absorbed nitrogen retained by the animal
(the higher the ration the better the protein)
2 equations to determine biological value
BV = retained nitrogen - digestible nitrogen
BV = (N intake - fecal N - urine N)/(N intake - fecal N)
why does fish meal contain more urinary nitrogen than cottonseed meal
fish meal has a higher amount of EAA that gets directly made into muscle whereas NEAA from CSM are used as a source of energy
why is feeding excess AA bad
wastes money
urinary N gets into environment
what amino acids are most likely to be limited in non ruminants(rate limiting AA)
lysine
methionine
threonine
tryptophan
what percent of CP (DM basis) do rumen microbes contain
30-50%
what is the BV of microbial protein
0.6-0.8
(similar to soybean meal)
what is efficiency of microbial growth dependent on
availability and timing of nitrogen and carbon skeletons
what are the 2 sources of protein in ruminants
microbial protein
RUP
T/F all species produce more high quality protein than they consume
FALSE. only ruminants do
T/F non-ruminants and ruminants have the same amount of protein digestion in the SI
TRUE
how does lipid and CHO digestion in the ruminant SI compare to in non-ruminants
ruminants digest less CHO and lipids in the SI than non ruminants
what is the gold standard feed for protein in swine
soybean meal
why would you want to feed cattle RUP
cattle that need higher amounts of EAA
EX: dairy cows
feeds with low RUP
grass hay
corn silage
barley grain
soybean meal
feeds with medium RUP
cottonseed meal
corn grain
alfalfa meal
feeds with high RUP
blood meal
feather meal
fish meal
why is the EAA profile in feed RDP unimportant
bc it will be degraded by the microbes and broken into ammonia and carbon skeletons
T/F feeding extra protein high in RUP to young steers has shown to be beneficial
TRUE
benefits of proper diet formulation
-reduce nutrient flow
-reduce excess N and P excretion/into the environment
-reduce buildup in soil
-reduce runoff/leaching to watersheds
-reduce ammonia emissions to the air
