Wildlife Nutrition: Facts or Fiction · •Lactation, pregnancy, maintenance, growth, etc....
Transcript of Wildlife Nutrition: Facts or Fiction · •Lactation, pregnancy, maintenance, growth, etc....
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Wildlife Nutrition: Facts or
Fiction
Hinner Köster (Ph.D.)
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Introduction
• Game have survived Southern Africa's harsh and variable
environments
• Able to have migrated from one area to another
• Found indigenous vegetation of high nutritional
quality
• Grass, shrubs and bushes
• Supplied their requirements for growth and reproduction
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Introduction
• Modern times these migration routes have been
largely fenced off
• Preventing animals from being able to move to
areas where the grazing or forage would be
better
• Selection limited especially during the drier
season
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If it's impossible to migrate or the whole area is in a
drought the animals will lose condition
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• Measures of fat stores (body condition)
– Primary mode of storing energy in vertebrates
• Play important roles in reproduction, migration,
and thermoregulation
– Good indices of nutritional status
Body condition
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Phenotype = Genotype + Environment
Dry
Ideal
Cold
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Profitability
• Profitability of modern intensive game farming practises
affected by:
• Reproduction
• Amount of offspring produced within a specific specie’s
reproduction cycle
• Performance of offspring
• Milk production of dams
• Growth after weaning
• Phenotypic condition and features of animals
• Body condition, hair coat
• Health, immune system
• Legs, feet (hooves), horn size
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Precision Feeding
• Game farmer has unique challenges
• Supply all specific species of animals
• with the nutrition they require
• in a specific defined area
• at specific time periods of the year
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Grass
Leaves
Selection intensity
Specie specific nutrition
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Area specific – unique characteristics
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Summer WinterP
rote
in
Oct Oct
Supply
Requirement
Season specific - Protein
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Summer WinterE
nerg
y
Oct Oct
Supply
Requirement
Season specific - Energy
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Summer WinterP
ho
sp
ha
te
Oct Oct
Supply
Requirement
Season specific - Phosphate
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Approach when
developing dietary/
supplementary feeding
programs for wild animals
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–Dietary habits in the wild
–Oral and gastrointestinal morphology and
physiology
–Needs of similar domestic species whose
requirements are known
–Environmental features that affect energy
and nutrient need
Consider
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Oral anatomy and gastrointestinal
tract morphology
• Oral anatomy and gastrointestinal tract
morphology have a high correlation with
natural diet
• Presence of a ruminoreticulum
–Qualitative nutrient requirements are
similar to those of cattle and sheep
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Oral anatomy and gastrointestinal tract
morphology
• Gut has a cecum and sacculated colon
–Capacious enough to support microbial
fermentation
–Nutrient needs are likely to be similar to
those of the horse
• A simple stomach with limited lower gut space
for microbial activity
–Similar to a pig (Ullrey, 1988)
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Oral anatomy and gastrointestinal
tract morphology
• Can extrapolate nutrient requirements
from domestic species with known
needs to wild species
–Similar in dietary habits and
gastrointestinal structure and
function
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• Beyond food habit studies, wildlife
biologists have used captive animals
–Made detailed studies of nutritional needs
•Associated with physiological functions such
as:
–reproduction
–growth
–horn development
Captive animal requirements
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• Relationship between nutritional status and
reproductive rate is thoroughly documented
– Good to know what the reproductive response of
animals to improvements in the supply of selected
nutrients is
– Animals in good physical condition generally have
higher rates of reproduction
• More resistant to all forms of mortality than are
animals in poor condition
Nutritional status vs reproductive rate
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Effect Of Weight Loss On Reproduction
(Estrus-activity)(Adapted From Louw, Thomas & Lishman, 1988)
Weight loss = 103 kg
(21%)
CS = 2,77*
CS = 1,72
CS = 2,23
Estrus Activity stopped
Weight Increase = 47kg
(13%)
Resumption of
Estrus Activity
*CS = Condition Score
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Economic
traits
Horns
• Length
Hair Coat
• Shiny
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Horn growth
Heritability of Male Horn Volume = 0.32
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Canadian Researchers assessed the effects of resource availability on
body mass and horn growth of bighorn rams at Ram Mountain,
Alberta, Canada over 30 years
They showed:
• Horn growth was positively correlated with feed availability
• Compensatory horn growth does not occur
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• University of Zürich (2015) measured 8043 Ibex from 1967
• No evidence was detected for compensatory horn growth
• Late-life horn growth was positively depended on early-life
horn growth in males
• Horns are dead tissue with no blood flow
• Require continuous levels of sufficient nutrition
• Horn growth rates continuously increased due to earlier and
higher spring-time temperatures
Alpine Ibex
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Annuli
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Nutrient
requirements of game
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Nutrient requirements of game
• Most herbivore game species on farms are ruminant
animals
• Exception: zebras, rhinos, hippopotamus, elephants, bushpigs,
warthogs
• Differences in eating habbits and alimentary tracts of
game within the same environment
• Makes supplementation aimed at the same specie impossible
• Supplementary feed for game still based on requirements
of similar domesticated animals (cattle, sheep, horses, pigs)
• Response of such domesticated species to spesific supplemental
feeds in a specific area to achieve a specific performance target
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• Game species would (in the habitat to which they
are adapted) select a diet
– With a digestibility in accordance with their feeding
habits and are thus classified accordingly (Hofmann
(1973)
• Bulk and roughage grazers
– Large, essentially grazing animals
– Not high degree of selection
– Capacious stomachs normally filled to capacity
– Relatively low-quality feed composed mostly of grass
Nutrient requirements of game
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• Browsers (Selectors of juicy, concentrated herbage)
– Feed mostly on the leaves, flowers and fruits of forbs, shrubs and
trees (Concentrated food)
– Small stomachs (usually <200 kg mean individual live weight)
– Include grazing animal which exercises some form of extreme
selective defoliation (white rhino - area selection)
– Normally filled to only 50-60% of their capacity
• Intermediate feeders (herbivores that eat both grass and
leaves)
– Have the ability to adapt in different seasons and places towards
grasses and leaves
– Have greater ability to tolerate variations in the quality of their diet
Nutrient requirements of game
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Factors affecting nutrient levels and
quality in natural forage
• Every game farm or reserve has a unique system
• Either intensive or extensive camps
• Game need a particular amount of nutrients
• Correct ratios at different levels during the physiological
changes of their life
• Lactation, pregnancy, maintenance, growth, etc.
• Specific but different daily nutrient requirements for:
• Protein, energy, macro- and trace minerals and
vitamins
• Certain natural forages may be suitable for some animals
but not for others
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Supplementation
• Nutrients that can in particular be limited on low-quality pastures:
• Energy
• Especially where pastures have been deteriorating and competition of game
increases
• Droughts
• Protein
• Rumen Degradable Protein in ruminant game
• Especially to utilise low-quality pastures and shrubs during the dry season
• Minerals and trace minerals (all species)
• Most areas require supplementary minerals and trace minerals throughout
the year
• Roughage (all species)
• High quality roughage supplementation (e.g. lucerne) would supplement
roughage, protein, energy and certain mineral shortages
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Economic feeding strategy for
breeding game on pastures
• Maximize use of nutrients in natural and established
pastures/stover/hay/silage1. Supplementation must complement roughage source
2. Critical to understand the effect of supplemental nutrients on the
intake and digestion of the roughage source • Low quality roughage – goal to increase intake and digestion
• Ensure optimal feeding conditions:
2. During breeding season
3. Shortly before calving/lambing (late pregnancy)
4. When calve/lamb suckles (lactating animal)
1. For maintaining live weight and condition during the dry, pregnant
phase• Supplementation before calving/lambing can have a larger impact on pregnancy
% than supplementation after calving/lambing (Marston et al., 1995)
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Why supplementation?
• Supplementation focuses on supplying
animals with the necessary nutrients that the
forage available to them cannot supply
• Supplementation is critical to:
• Ensure optimal degradation and digestion of
available forage
• Prevent nutrient imbalances
• Improve/maintain condition score, production
and reproduction
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Degradation and digestion
of available forage
• The most important facet of ruminant
feeding
• Understanding the nature and behaviour of
the microbial population in the rumen
during the different climatic seasons
• Focus on feeding the rumen microbes
– Ensure optimal intake and degradation of dry
forage/ roughage
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Entodinium parvum
species, 30 to 70% in
Springbok, with a
shorter generation time,
multiply rapidly utilizing
starch and other readily
available substrates.
Eudiplodinium sablei
species, unique to
Sable antelope.
Entodinium taurinus n.
species unique to Blue
Wildebeest.
Challenges of microbial diversity
within game
• Thriving on different nutrients
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NH3
urea
MCPAA
NH3
Dietary
crude
protein
A
B1
B2
B3
C
Pep
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Supplemental nutrition on low quality
roughage sources
• Dry pastures, standing hay, stubbles, stover
– Contains insufficient protein – first limiting• Insufficient protein for rumen microbes, especially where no
green material is present
– Microbes take >48 hours to degrade the available forage
– Decreased supply of nutrients from the rumen to the rest of
the animal's body
– Animal mobilizes stored reserves (e.g. fat and protein)
• Produces energy for survival
• Results in loss of condition and muscle mass
– Low digestibility• Proper digestion of consumed material cannot take place
– Results in lower intakes and digestibility values
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• Animals that do not receive any supplementation during the dry season
– Intake of forage is ±0,3-0,5% less of their live body mass (DM basis)
than animals that receive supplementation during the dry season
• Intake of forage in wetter months is:
– ±0,3-0,5% more of their live body mass (DM basis) than animals that
receive supplementation during the dry season
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Requirements and Intake
–Governed by Metabolic BW (W0.75)
and not BW per se
–Within a feed type, small animals
eat more on a BW basis than large
animals
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Maintenance Energy
Requirement (all species)
Based on non-pregnant,
mature female
0.55 MJ ME/kg W0.75
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EXAMPLE : INTAKE CALCULATION
•Buffalo female, 530 kg BW, maintenance
• W 0.75 = 530 0.75 = 110.46 kg W0.75
• MER = 110.46 kg W 0.75 *0.55 MJ ME/kg W 0.75 = 60.75 MJ
ME/day
• Feed quality (ruminant, grazer) = 7.4 MJ ME/kg DM @
88% DM = 6.51 MJ ME/kg AF
• Feed Intake = 60.75 MJ/6.51 MJ/kg = 9.33 kg
• FI (% BW) = 9.33 kg/530 kg * 100 = 1.76%
• Intake for other objectives relative to maintenance• For growth & general well-being = +10% (1.75% * 1.1 = 1.9%
BW)
• For lactation = +30% (1.75% * 1.3 = 2.3% BW)
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0
5
10
15
20
25
30
35
40
0 1 2 3 4 5 6 7
Total DIP Intake, g/kg BW .75
To
tal
DO
MI,
g/k
g B
W.7
5
DIP Requirements
= 4.01/36.15
= 11.1% of DOM
Forage DIP = 53%
Estimating DIP Requirements using the
One Slope, Broken-Line Model (Köster, 1996)
Breakpoint = 4.01
530 kg animal
= 5300.75 x 4.01
= 110.46 x 4.01
= 443 g RDP/day
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RDP requirements and supplementation of
game on low quality pastures
• Assumptions:– Animal: Dry pregnant buffalo
– Weight: 530 kg
– Forage quality: 5% CP (AI basis)
– Degradability of CP from grass: 55%
– Grass intake: 9.3kg
• Requirements:
– 5300.75 kg x 4.0 = 110.5 x 4.0
= 443 g total DIP/animal/day
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RDP requirements and supplementation
of game on low quality pastures
• DIP from grass:
– Grass intake: 9.3kg
– Total CP intake from grass = 9.3 kg x 5% = 465g
– DIP intake from grass = 465 g x 55% = 256g
• DIP that needs to be supplemented to optimize
utilization of the grass:
– 443g total DIP/cow/day - 256g DIP from grass
= 187g DIP/530 kg animal/day from supplement
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Effect of different levels of urea on True OM
Digestion of hay in the rumen – Cattle
(Köster, 1993-1995)T
rue
OM
dig
esti
bil
tiy,
%
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Effect of different levels of urea on DOMI of
hay in the rumen – Sheep (Nolte, 2001)
10
15
20
25
30
35
40
0 25 50 75 100
% N from from Urea
Ha
y D
OM
in
tak
e, g
/kg
BW
0.7
5
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Urea supplementation of game on low quality pastures
• Larger ruminants
– CP can be derived 100% ex NPN
• Game preferably 75-80%
• Small ruminants
– >25% of CP as NPN
• Not effectively used but still safe
• Non-ruminants
– NPN not useful
– Yet not lethal
• Zebras grazing in a mixed species camp
– Dietary protein deficit not covered by protein supplements ex NPN
– Yet not lethal
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Higher performance is dependant
on individual amino acid supply
-Rumen Non Degradable Protein-
IDEAL
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First limiting nutrient allowable growth
Protein
High Min + Fat
Horn Growth
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Supplemental nutrition on green
pastures• Sufficient protein
–Sufficient protein for rumen microbes and often also to maintain
certain level of animal production
•Microbes take ± 12 hours to degrade the available forage
–Supplementing rumen non-degradable protein (amino acids) to
maintain higher production
•Lactating and late pregnant animals, pregnant young
animals, growing animals
– Can result in positive response
– Depends on performance target and economy
– Colostrum quality (calf health)
• Problem:– Mainly Minerals
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Effect of different types and levels of energy on digestible
OM intake of low quality hay (Le Roux, 2002)
34,3 33,6
30,8
34,2
36,9
20
25
30
35
40
Starch Cellulose Sucrose 1MJ
ME/d
7MJ
ME/d
Hay
DO
MI,
BW
0.7
5
DIP = 4.67 g/kg BW0.75
Energy types Energy levels
(Molasses)(Bran)(Maize)
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Energy Supplementation on low
quality pastures and/or roughage
•Feed grain and other energy sources if:
–Goal of energy supplementation •Achieve additional production above maintenance on
pastures
–Production licks/blocks or pellets/self mixed feeds•Female animals with calves/lambs in winter
•Dry, pregnant female and male animals at any stage
not in optimal body condition
•Young animals
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Mineral and Vitamin
supplementation
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• Required in small quantities
• Essential for all physiological systems
• Especially critical for growth, reproduction, milk,
development, immunity, enzyme functions, cell
regulation, etc.
• Subclinical shortages biggest problem
– More important than acute problems
• If there are no symptoms beyond an inexplicable drop in
reproduction efficiency, growth rate or condition score
– Makes the identification of which mineral it is that is
deficient very difficult
Minerals
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Mineral interactions
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Organic vs Inorganic trace minerals
• Bio-availability
• Organic sources high
• Inorganic sources differ substantially
• Reduced interaction (antagonistic) problems with organic sources
• Organic substantially more expensive
• Supplement selectively
• Normally not required for grazing animals
• With problems like osteochondrosis, hoofs (horn growth), reproduction, etc., also strong consideration
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Typical observations on farm with trace mineral
shortages
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• Cu and Zn especially are important for strengthening
hoofs and stimulating horn growth• Organic Zn is especially used world-wide to improve hoof
integrity of livestock
• Zn is also used: • Proper keratin formation
• Important for wound healing, skin health, hoof/horn
structures
• Limtation of Zn in male animals
• Spermatogenesis, Inhibits maturing of spermatozoa,
Atrophy of the semen carrying tubes, Testicle size , Libido,
Retards puberty
Hoof Integrity, Horn Growth, Skin
Health and Reproduction
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Analyse Water!
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Vitamins• Important vitamins needed by herbivores are:
– Vitamin A, D, E (Browsers), K, B12, Thiamin,
Niacin, etc.
• Most of the deficiencies have been detected in
captive animals
• Free-ranging wildlife continually adapt their food
habits to avoid diets deficient in one or more of the
vitamins
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• Biotin
• Safe water soluble B vitamin
• Very important in growth and strengthening of
the cartilage in hoofs and horns
• Supplementation in game:
• Directed towards strengthening hoofs and
horn growth
• Achieving maximum hoof strength and horn
length
HOOF INTEGRITY AND HORN
GROWTH
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Future Directives• A combination of basic and applied research is essential
– Conducted on both free-ranging and captive animals
– A cross-disciplinary approach must continue
• Combine qualitative information on natural feeding habits with
quantitative data on food nutrient composition and utilization
– Can provide direction for further development of optimal diets for
captive/confined game animal management
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Thank
You