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Final models for the difference in methane emissions (g) per litre of milk produced following the implementation of 3 reproductive management programmes in dairy herds compared to a baseline1 scenario.

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posted on 10.06.2015, 04:00 by Simon C. Archer, Christopher D. Hudson, Martin J. Green

1 Cows submitted for service based on observation of oestrus only (Group 1).

2 All cows treated with gonadotropin releasing hormone and prostaglandin such that they all receive a first service between 50 and 64 days in milk regardless of oestrous detection. Repeat services based on observation of oestrous.

3 All cows treated with gonadotrophin releasing hormone, progesterone, and prostaglandin such that all cows can receive a first service between 50 and 64 days in milk. Repeat services based on observation of oestrus.

4 Cows not observed in oestrous treated up to 2 times with prostaglandin to increase the probability of oestrus between 50 and 64 days in milk. All services based on observation of oestrus.

5 Standard error.

6 Proportion of eligible cows that are served prior to intervention (centred on the mean). Polynomial term.

7 Proportion of served cows that conceive prior to intervention (centred on the mean). Polynomial term.

8 Cumulative 305 day milk yield (thousand kg; centred on the mean).

9 Voluntary waiting period (days) from calving to first service (centred on the mean).

Final models for the difference in methane emissions (g) per litre of milk produced following the implementation of 3 reproductive management programmes in dairy herds compared to a baseline1 scenario.

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