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Flashcards in Beef production lec 3 Deck (16):
1

what are the increasing nutritional demands of a pred/lactating cow

energy and protein, 2% of LW DMI

2

what is the MJ ME required daily for a preg cow?

 requires MJ ME 66-78,CP% 6

3

what is the MJ ME required daily for a cow in peak lactation?

 requires 95 MJ ME, CP% 10

4

when is a cow in peak lactation?

4 months

5

what are the feed demands of young stock

o to increase growth rate need to increase ME and CP%
 generally lower then cows
o usually in excess, most expensive to feed
o DMI 2.5% to 2.1%

6

in the SW slopes, what is the average daily growth of pasture?

o can get 10-15kg DM growth/ha/day

7

When does SR need to be maximised?

o have max SR over winter to utilise spring growth
o breeding cows have an increased SR

8

what is the ME of pasture

11 MJ ME

9

what is CMW

o Average weight of a group of heifers at which about 85% would conceive from a 45 day mating
o % of body weight 60-65% of mature weight

10

when does a heifer need to be joined to calve at 2 years?

9 months preg, 15 month joining

11

what is the CMW of british and European breeds?

 British – 280kg-300kg
 European + Bos indicus – 300-320kg

12

what would be the CMW of a cow that had a MW pf 515kg?

 MW = 515kg
 CMW = 0.6 x 515 = 310kg

13

if a heifer was weaned at 200 kg at 240 days and a mature weight of 515kg, how much ADG would it need?

 MW = 515kg
 CMW = 0.6 x 515 = 310kg
 Weaning (240 days or 8 months) wt = 200 kg (actual)
 Then must gain 110kg by 390 days (13 mths)
 =0.73kg ADG for 150 days (steady growth)

14

what is the impact of BCS on fertility?

o higher BCS
 higher % in oestrus (cycling)
 higher % proportion pregnant

15

what are the KDP for heifer growth?

 Weaning, yearling weight
• weighing allows time to reach CMW

16

what are the KDP for cow condition?

 Calving
• BCS 3 for spring, 3.5 for autumn (less feed available in winter)
 BCS at weaning
 BSC at joining