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Ag Sci animal N > comp of feed > Flashcards

comp of feed Flashcards

1
Q

what is the biggest challenge with composition of feedstuffs

A

realtime measurements

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2
Q

what are the 5 assessments on the quality of feeds

A

quantity
availability
degradability
balance
capture

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3
Q

over what % of fat can effect carbohydrate breakdown

A

5/6%

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4
Q

what component of feedstuffs has the largest effect on feeding value

A

fibre

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5
Q

what does acid detergent lignin measure

A

lignin

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6
Q

what does acid detergent fibre measure

A

lignin and cellulose

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7
Q

what does neutral detergent fibre measure

A

lignin, cellulose and hemicellulose

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8
Q

what % should NDF content be maintained at as proportion of dry matter

A

30%

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9
Q

what % of NDF content should be made up of forages

A

21%

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10
Q

what does NDF fraction of fibre stimulate

A

stimulates chewing activity and related to particle size

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11
Q

approx what is the % of energy lost due to methane

A

6-7 %

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12
Q

what is nutrient availability influenced by

A

degradability

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13
Q

what would a good protein content be in a silage sample

A

above 12%

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14
Q

2 factors that will reduce the bacteria growth in a silage sample

A
  1. removal of oxygen from silage using compactor
  2. keeping pH low as close to 4 as possible inhibit bacteria growth
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15
Q

what is a good DMD of silage

A

above 70% good
average 67-68%

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16
Q

what is the aim of ammonia in a silage sample as % of total nitrogen

A

below 10%

17
Q

what does high ammonia in a silage sample indicate

A

bad conservation

18
Q

why is high lactic acid needed in silage sample

A

to reduced pH of sample leading to more protein and energy conserved

19
Q

how can a DMD of 75% compared to 60% have an effect on liveweight gain

A

up to 60% lower liveweight gain

20
Q

what is the total amount of feeds imported to country for animal use in tonnes

A

700 million tonnes

21
Q

why is soya highest imported cereal what does it offer

A

bioavailable amino acids/ quickly available

22
Q

in a wheat grain where in the starch for energy located

A

endosperm

23
Q

list some low protein feeds

A

cereals
beet pulp/ citrus pulp
soya hulls
molasses

24
Q

what is the oil content of cereals 10 - 60g/kg

A
25
Q

why are cereals processed ?

A

to make starch more available
increase surface area for uptake

26
Q

why are citrus or beet pulps used

A

to maintain fibre in the rumen and increase saliva production

27
Q

why is sunflower meal not used in Ireland even though has a CF of 28%

A

because quality of protein is not good

28
Q

what is a common deficiency caused feeding too much soyabean

A

iodine deficiency as raw beans contain goitregens inhibiting the uptake of iodine

29
Q

why is cottonseed meal not often used

A

very variable
may contain gossypol
risk of aflatoxins

30
Q
A

Ag Sci animal N (11 decks)

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