Lecture 3 Flashcards
(97 cards)
List the 2 production systems in the dairy industry:
-Spring Calving System
-Autumn Calving System
What are majority of the hers in Ireland and what % of herds are they?
-Spring Calving Systems
-90%+ herds are spring calving
-Involved in production of seasonal milk processing
A cows year:
List the different parts of a cows year cycle and how many days in each:
1- Calving
2- Early lactation (100 days)
3- Mid lactation (100 days)
3- Late Lactation (100 days)
4- Dry Period (65 days)
What is the predicted yield of a dairy cow?
305 days
When do most metabolic issues happen on a dairy farm?
80-90% of metabolic issues occur from calving through to milk season
When do cows reach peak lactation?
6 weeks into lactation
When is the transitional period of a cows cycle?
14-21 days before calving and 14-21 days after calving
When do cows need a high energy status?
In early lactation- conception must be managed correctly
At least 130 days
When does peak grass growth occur?
When peak milk production occurs, usually in june/july
How much crude protein do dairy cow require in their overall diet?
17% CP
What happens of you give too much protein?
Its excreted through urine in faeces
How much nitrogen can a cow retain?
up to 25% - they excrete the rest
Spring Calving Based System:
1-What do you feed the cows?
2- What % of total milk production comes from this feed?
1- Grazed grass = lowest cost feed , high quality grass.
2- 90% of total milk production is from grazed grass.
Increasing milk production from grass=
Reduces costs and maintain farm incomes
If you increase grazed grass by 10% in a feeding system the cost of milk produced will be …
reduced by 2.5 c/l
Whats the CP DM % range in grass?
16-28% /kg DM
Whats the UFL range in grass DM?
0.85-1.05/kg
What is the average CP g/kg in medium grass :
1-Average:
2-Spring:
3-Summer:
4-Autumn:
1- 199
2- 203
3- 198
4- 196
What is the average Energy (UFL4/kg of DM) in medium grass :
1-Average:
2-Spring:
3-Summer:
4-Autumn:
1- 1.04
2- 1.03
3- 1.06
4- 1.01
Spring Production System:
1- When does calving start and how long does it go on for?
2- When are majority of cows calves?
3- What months are calves morn between?
4- How long do calves get milk for and what’s the process afterwards?
5- When are cows turned out to grass , how long to they stay out for?
1-Calving starts in Jan/Feb and goes on for about 12 weeks
2- Majority of cows calve in first 6 weeks (Target!)
3- Calves born (mostly) between January and April
4- Calves milk-reared for 8 weeks+ – then weaned. May be sold or kept on dairy farm as a beef enterprise
5- Cows are normally turned out to grass quickly after calving and stay out until late autumn (Oct or Nov)
What does turnout date depend on?
Location in the country
1- How long is the dry period ?
2- What are the breeding options for the herd and does breeding start?
3- How long is gestation of a cow?
4- How long does breeding season go on for?
1- Dry period for approx. 8 weeks before they calve down again
2- Breeding: AI or stock bull – starts around 1 May for 1 Feb calving
3- Gestation = 280 days approx
4- Breeding season is usually 12 weeks – cows not in calf at this stage are culled from the herd
When is there a deficit of grass?
Jan-April and Sept-Dec
Must feed supplement like conc or forage
How do you calculate lactation yield?
Peak yield x 220= lactation yield