Weaning - The Angora goat ewe
By Dr Mackie Hobson

Monday, 18th March 2019

Angora goat farmers wean the kids at slightly different times depending on the environmental conditions and time of kidding/mating. A balance needs to be made by the farmer between the impact on the kids and the ewes being in a good enough condition to conceive at the following mating.

The effect of weaning stress is well known but what is surprising from studies is how little effect the time of weaning has on the ewe.

The impact of weaning stress on Angora kids.

 

Studies by King et al. (1991) reported no significant differences in the average daily gain (ADG) of weaned and un-weaned kids from 4-7 months of age when kids were fed under intensive feeding conditions.

These findings by King differed from studies by Gretha Snyman where kids were supplemented between 4-7 months. Gretha found that the impact of weaning stress on growth rates was still marked even when the kids were fed.

  • Where ewes and kids received supplementary feeding (80% milled lucerne and 20 % mealie meal) the average daily increase (ADI) of the un-weaned group was 33, 8 g compared with the 21,9 g of the weaned group.
  • In above average veld conditions studies by Gretha Snyman found that the ADI of weanedkids was 10, 2 g while the ADI of the non-weaned group of kids was 34 g during the same 4-7 month old period.

 

The findings by Gretha Snyman demonstrates the importance of the nutrition (supplementary feeding) of the kids to reduce the impact of weaning shock on the kids.

 

Supplementary feeding should be started at least 2 weeks before weaning. It is also better to move the ewes initially as the kids will be familiar with finding the source of feed and water and so reduce the stress.

 

What impact does weaning have on the ewe?

Studies by Hoon, Olivier and Griesesel evaluated the body weight change of ewes from weaning (4months) until mating/scanning, the milk production of the ewes and the conception rate of ewes in the next breeding season. These studies were of ewes on veld conditions (above average) in Middleburg district from about 2003-2006.

  1. A comparison of Body weight between ewes which weaned their kids (4 months) and those where the kids were not weaned.

Body weights and BWC (± s.e.) of ewes - three year period

 EWE

Kids Weaned at 4 months

Kids Not weaned

Weight at weaning (kg)

29.21 ± 0.26a

31.40 ± 0.27b

Weight at mating (kg)

31.63 ± 0.27a

33.18 ± 0.28b

Body weight change (kg)

2.40 ± 0.14a

1.73 ± 0.15b

 

 

  1. The conception and scanning percentages of the ewes - four year period

 EWE

Kids Weaned (4 months)

Kids Not weaned

Conception percentage (%)

87.2

92.9

Scanning percentage (%)

104.4

112.3

Conception % - number of ewes scanned pregnant per number of ewes mated

Scanning % - number of kids scanned per number of ewes mated

 

What is surprising from these studies was the fact that weaning/not weaning, under good veld conditions, did not have a big impact on ewe production figures.

What does the milk production of the ewe tell us about weaning?

If we look at studies by Hoon, Olivier and Griesesel on milk production by ewes on the veld (2003-2006, Middleburg district) we see the natural production of milk by these ewes.

weaning_ewes_1.png

If we look at the graph in relation to some of the facts we know these may then make sense.

  • The kids dry matter intake (veld) naturally increases dramatically after at about 6 weeks of age and so the kid become less dependent on the ewe.(Drop in ewes milk production)
  • From the graph it of the Angora ewe’s milk production we can see why weaning before 10 weeks is not advised
  • We also know that Angora ewes will wean their kids naturally by the five and a half months
  • The reason most farmers wean the kids at about 4 months.

For more information on milk production by the Angora ewe see the SAMGA website https://www.angoras.co.za/article/milk-production-by-the-angora-ewe#303

What is surprising from these studies, under good conditions, how little impact weaning has on the ewe production while having a major impact on kid production? 

 

REFERENCES

  • The effect of different weaning practices on post-weaning growth rates of Angora Kids and reproduction of Angora ewes. (J.H. Hoon#, W.J. Olivier & P.J. Griessel)
  • The effect of weaning on the growth of Angora goats (P R King, J J Olivier and D Wentzel)
  • Body weight and growth rate of Angora goat kids (Gretha Snyman )

 

Grootfontein Agricultural Development Institute, Private Bag X529, Middelburg (EC), 590

© SA Mohair Growers - 2019 | Links | Weaning - The Angora goat ewe

Website Design and Search Engine Optimisation (SEO) by ZAWebs Designs | Web Hosting by ZAWebs Hosting