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PIG PROGRESS VOLUME 32, No. 4, 201632
Pre-weaning
nutrition:
How a little
means a lot
NUTRITION
In an environment with highly prolific sows and
challenging markets, it is vital to get piglets drinking
early and rapidly. This is essential not only in the
days and weeks surrounding weaning. Ongoing
research shows that a good start continues to pay
off later in life.
By Hubèrt van Hees, Trouw Nutrition R&D and Maartje De Vos,
Trouw Nutrition Benelux
Over the years, genetic selection has resulted in a
substantially increased number of piglets born
per sow in each litter worldwide. This increase
in litter size often means smaller and more vul-
nerable piglets, with greater variation within lit-
ters. At the same time, when sows deliver large litters, their milk
does not increase in proportion to the increased number of pig-
lets born and thus the piglets suffer from a milk shortage. As a
result, it is becoming increasingly common practice to provide
suckling piglets with feeds to supplement sow milk.
This article examines the relevance of early supplemental feeding
to supporting piglets’ growth and development.
Surveys of sows
In a recent survey of 224 sow farmers in Belgium carried out by
Ghent University, approximately 50% of the farmers had experi-
enced issues with the number of piglets exceeding the number of
functional teats on a sow (i.e. supernumerous piglets). In total,
90% of these farmers indicated that they used dry or gruel feed
and 49% used supplemental milk to alleviate the issues related to
supernumerous and small piglets.
Work recently conducted in the Netherlands yielded similar
results, with the proportion of farms using a milk supplement
increasing from 49% in 2014 to 54% in 2015. In this respect, the
market in Belgium, the Netherlands and Luxembourg (Benelux)
seems to be taking the lead.
Figure 1 shows that bigger litters of up to 15-16 generally mean
that total litter weights at weaning are increasing and the availa-
bility of milk per piglet is falling. As a result, there is a risk that
individual body weights at weaning will be reduced by 1 kg or
more if no corrective actions are taken.
Supplemental feeds aid ‘catch-up’
Data generated recently supports the view that it is worthwhile
supporting the less fortunate piglets in large litters during the
first weeks in life. For example, when analysing a data set of over
60,000 piglets born at three experimental stations, we concluded
that not only birth weight, but also weaning weight and the body
weight two weeks post-weaning are important determinants for
body weight at the end of the nursery phase. This concurs with
data from other groups that extended this observation up to
slaughter weight. Moreover, our analysis showed that lighter pig-
lets can catch up with their heavier peers because they seem to
have the ability to efficiently digest nutrients and grow like their
heavier littermates.
Importance of early feed intake
Typically, supplemental feed intake is relatively steady up to two
weeks of age and increases, first gradually then sharply, up to
weaning. This pattern coincides with the gap between milk pro-
duction and the nutrient requirements of the fast-growing litter
PHOTO: TROUW NUTRITION
PIG PROGRESS VOLUME 32, No. 4, 2016 33
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
LS-10 LS-11 LS-12 LS-13 LS-14 LS-15 LS-16
Litter size
Percentage of litter
Figure 2 - Increasing litter size stimulates more piglets in a litter to eat
supplemental feed. Pink bar = % eaters; Blue bar = non-eaters on day 20.
Source: Trouw Nutrition R&D, 2015
in the later phases of lactation. From studies conducted at the
Swine Research Centre in St Anthonis, the Netherlands, intakes
were observed that vary between 0 and over 1 kg of dry matter
per piglet over a 24-day lactation period, with 400 g being a
good average. The level of intake is influenced not only by litter
size, but also by lactation length, milk production and ambient
temperature. Milk production, in fact, depends on temperature:
a sow under heat stress will have a reduced milk output, forcing
her litter to find additional sources of nutrition.
Contrary to general belief, birth weight has only a limited influ-
ence on the supplemental feed intake of piglets. Our observa-
tions showed that the average birth weight of ‘eaters’ is similar to
that of ‘non-eaters’ and that, in both categories, piglets that are
very light (<1 kg) and heavy (>2 kg) are represented. Figure 2
clearly shows that individual piglets in larger litters are more
likely to consume supplemental feed. In this graph, the percent-
age of piglets that were identified as eaters was scored using a
faecal colour marker. The percentage of eaters increased with lit-
ter size.
The stimulatory effect of farm workers paying sufficient atten-
tion to supplemental feeding is demonstrated by the data in
Figure 3. In this work, a premium pre-weaning programme was
fed (Milkiwean Yoghurt and Milkiwean Precoce), either in a low
or a high, intensive regime. Clearly, the level of consumption was
raised by the more intensive feeding regime (four feedings per
day, versus two times per working day and one feeding in the
weekend) starting early in life. Supplemental feeding can, but
not always, affect body weight development until weanting. In
general, however, post-weaning performance and health will be
promoted. Also, especially with longer lactations, one might
observe that sows are better able to maintain body condition.
Sometimes effects are more subtle, as will be explained below.
A closer look at the gut
To explain how relatively low levels of supplemental feeding
affect post-weaning performance, a study was conducted into
pre-weaning gut development. The hypothesis was that creep
feed represents energy provision and – by its specific composi-
tion – induces the secretion of gut hormones that modulate
intestinal development. So a group of piglets was studied that
consumed a highly nutrient dense, complex milk replacer (i.e.
Milkiwean Yoghurt). By contrast, the control piglets had no
access to supplemental feed and solely relied on sow milk. The
piglets were from very prolific sows (at least 13.5 piglets) of sim-
ilar parities (3.6 ± 0.8). On day 21, these piglets’ body weight and
gut development was assessed. Supplemental milk consumption
was close to 70 g of dry matter per piglet per day and weight
Supplemental feeding
not only helps piglets
around weaning, but
also affects post-
weaning performance.
Milk production of the sow Per piglet
12500
11000
9500
8000
6000
5000
3500
1100
Sufficient
milk per piglet
Shortage in
milk per piglet
1050
1000
950
900
850
800
456789
Litter size piglets
Milk production of the sow (gr/day)
Available milk per piglet gr/day
10 11 12 13 14
Figure 1 - Milk production per litter and milk intake per individual piglet
in relation to litter size.
Source: Adapted from Dourmad, 2012.
PIG PROGRESS VOLUME 32, No. 4, 201634
1000
Feed intake per litter (grams dry matter)
900
800
700
600
500
400
300
200
100
0
78910111213141516
Days in lactation
17 18 19 20 21 22 23
Low intensive feeding Intensive feeding
Figure 3 - Comparing a low intensive with an intensive
practice of supplemental feeding on feed intake of
litters.
Source: Trouw Nutrition R&D, 2015.
gain was 20% more (310 vs 255 g/day) in the milk-fed piglets
during the week prior to post-mortem analysis.
Close to 90% of the piglets consumed the supplement, which
underlines the desire of piglets in current production systems to
have access to supplemental nutrition, in addition to sow milk.
Besides the fact that the pigs fed a milk replacer were about half
a kilo heavier, litters were also more homogeneous than the con-
trol group. Moreover, the small intestine of the piglets was heavi-
er than that of the control animals, both in absolute terms and
when expressed as a percentage of their body weight. Also, the
gut of these animals showed signs of higher cell proliferation, i.e.
increased crypt depths and PCNA (a marker for cell prolifera-
tion). Furthermore, other indices for gut development and gut
function were more favourable in piglets fed the milk replacer.
Moreover, the animals fed a milk replacer had higher concentra-
tions of fermentation products (e.g. butyrate) in the large intes-
tine, indicating a higher microbial activity. It is conceivable that
all these changes in milk-fed piglets lead to a better response to
the weaning transition owing to an increased capacity for the
uptake of nutrients.
Importance of supplemental feeding
Larger litters mean the need for proper supplemental feeding
is increasingly important. Providing supplemental milk and
creep feed does not necessarily lead to a higher weaning
weight, especially when weaning occurs at an early age. The
main benefit arises from a better developed gut at weaning
and enhanced post-weaning performance. It is therefore
important to encourage farrowing room staff to stimulate feed
intake by providing palatable and well-balanced diets via dili-
gent feeding management.
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