Beef Cattle Nutrition Flashcards

1
Q

T/F there are more beef cows in texas than the next top 2 states combined

A

TRUE

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2
Q

what year had the lowest beef cow inventory in recent history

A

2024

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3
Q

what has led to decreased GHG emissions

A

better nutrition and genetics

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4
Q

how has the lessened inventory of cattle impacted the amount of meat produced

A

no impact, no less meat has been produced

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5
Q

what size farms make up almost 50% of the beef cattle inventory

A

small farms(<100 head)

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6
Q

T/F feedlots are highly vertically integrated

A

TRUE

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7
Q

T/F cow-calfs are highly vertically integrated

A

FALSE

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8
Q

which produces more lean meat a year cow or pig?

A

Pig

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9
Q

conventional beef production center uses what technology

A

all available FDA approved technology

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10
Q

how are natural beef productions run

A

similar to conventional beef production but without performance enhancing technology

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11
Q

how are grass fed(organic) beef production systems run

A

-plant based
-no performance-enhancing technology
-no feedlot/high grain
-no gmo feeds

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12
Q

what percent of Tx feeds are gmo

A

90%

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13
Q

which production system has the highest production cost

A

grass-fed

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14
Q

what percent of energy budget fed in production systems goes to cow maintenance

A

50%

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15
Q

what percent of energy budget goes to slaughter progeny

A

30%

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16
Q

thermal neutral zone

A

temperature where energy requirement is lowest

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17
Q

what breeds energy requirement is 20% higher than other breeds

A

semintal

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18
Q

T/F all 3 trimesters of pregnancy increase the cows energy requirements

A

FALSE. only the third

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19
Q

key macrominerals for lactating cows

A

phosphorous
sodium
chlorine

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20
Q

what macromineral in generally never deficient in lactating cows

A

sulfur

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21
Q

importance of sodium and chlorine in diet

A

regulate water and acid-base balance

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22
Q

where is 80-90% of calcium and phosphorous stored in the body

23
Q

what feed types are typically high in Ca

24
Q

what feed types are generally high in P

A

concentrates

25
what is the most prevalent mineral deficiency in grazing livestock
Phosphorous
26
what is the 3rd most abundant mineral in the body
Potassium
27
what is the 3rd most abundant mineral in bone
Magnesium
28
T/F forages seldom contain adequate concentrations of trace minerals
TRUE
29
what vitamins need to be supplemented in cattle
A, D, E
30
supplement methods for cows
free-choice meals free-choice blocks free-choice liquid limit fed injectible
31
4 stages of production for cow herds
1. calving to breeding 2. breeding to weaning 3. weaning to late gestation 4. late gestation
32
which stages of cow production are considered critical
1 and 4
33
when should cows be rebred by after calving
84 days
34
why is period one in cow production critical
it is preparing the cow for rebreeding cows with BCS <4 conceive later and have lower pregnancy rates
35
what production period has the lowest energy requirements
3rd period
36
why is period 4 a critical period for production
rapid fetal growth BCS <4 decreases calf survival rates, increases breeding interval, weight loss during lactation, and increases distocia
37
what is the ideal body score to breed at
5-6
38
weak calf syndrome
energy not properly met during 4th period leads to weak calves and more susceptible to pathogens, cold stress, and death
39
what vitamin works with selenium to enhance semen qualities
Vitamin E
40
what vitamins and minerals enhance cows immune system
Cu Mn Zn Se vitamin E
41
what is the critical number for CP% for microbes to function
7%
42
what happens in CP is below 7%
decreased fermentation decreased digestibility and rate of passage decreased DM intake
43
what should the TDN:CP ratio be
around 4
44
forage above what TDN:CP ratio is considered poor
7
45
what percent of mature body weight should first calf heifers be at for breeding
60%
46
what percent of mature body weight should first calf heifers be in for calving
80-85%
47
what percent of breeding heifers are replaced each year
20-25%
48
what age should first calf heifers be bred at
14.5 months
49
Target ADG equation
(breeding weight-weaning weight)/(breeding age-weaning age)
50
negative effects of overweight heifers
-reduced conception rates -impaired mammary gland development -decreased milk production
51
T/F milk production decreased due to obesity during heifer development can be remedied by weightloss
FALSE, its a lifelong decrease
52
creep feeding
supplement is placed so its only available to nursing calves
53