Die diagram hieronder toon die embrio en fetusontwikkeling in plaasdiere - NSC Agricultural Sciences - Question 4 - 2017 - Paper 1
Question 4
Die diagram hieronder toon die embrio en fetusontwikkeling in plaasdiere.
4.1.1 Identifiseer strukture B, E en F.
4.1.2 Noem die volgende oor strukture D:
(a) EEN... show full transcript
Worked Solution & Example Answer:Die diagram hieronder toon die embrio en fetusontwikkeling in plaasdiere - NSC Agricultural Sciences - Question 4 - 2017 - Paper 1
Step 1
Identifiseer strukture B, E en F.
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B is die 'Fetus', E is die 'Neeltring/plasenta', en F is die 'Allantois'.
Step 2
Noem die volgende oor strukture D:
(a) EEN funksie
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Die funksie van D is om die fetus teen skokke/absorberende skokke te beskerm.
Step 3
(b) EEN bestanddeel
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Een bestanddeel van D is die amnio/C.
Step 4
(c) Plek waar dit aangetref word
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Struktuur D kan in die baarmoeder gevind word.
Step 5
Dui die tyd (in maande) aan waartydens die melkkoper met 'n rektale swangerskapsondersoek die teenoorgesteldheid van 'n fetus sal kan bepaal.
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Die melkkoper kan dit in die 4-maan tydperk bepaal.
Step 6
Verduidelik die term hormoon.
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Hormoon is 'n chemiese stof wat deur die endokriene kliere afgeskei word en werking het op 'n spesifieke ziel of weefsel in die liggaam.
Step 7
Gee die hooffunksie vir ELK van die volgende hormone:
(a) Testosteroon
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Testosteroon stimuleer die ontwikkeling van die sekondêre manlike kenmerke en verhoog geslagsdrang.
Step 8
(b) Lutieniserende hormoon (LH)
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LH stimuleer die ovulasie en die vorming van die corpus luteum.
Step 9
(c) Estrogeen
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Estrogeen stimuleer die ontwikkeling van vroulike geslagsorgane en reguleer die siklus.
Step 10
Bepaal die aantal koeie in estrus.
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Daar is 10 koeie in estrus gedurende die gemete tyd.
Step 11
Dui die tyd aan wanneer 20 koeie in estrus sal wees.
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Die tyd is 18:00 tot 00:00.
Step 12
Verwys na die grafiek en voorspel die tendens van die aantal koeie wat van 12:00 tot 06:00 in estrus is.
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Die tendens sal 'n verhoging na 45 koeie wees.
Step 13
Bereken die getal koeie wat van 18:00 tot 06:00 in estrus is.
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Dit is 30 koeie.
Step 14
Verwys na die grafiek hierbo en stel die beste tyd voor om die koeie te insemineer.
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Die beste tyd om te insemineren is tussen 12:00 en 18:00.
Step 15
Gee EEN rede vir die antwoord op VRAAG 4.3.5.
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Tydperk met die meeste koeie in estrus.
Step 16
Identifiseer deel A, B en C.
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A is die 'Alveolus', B is die 'Duktus' en C is 'Speen'.
Step 17
Definieer die term laktasie in melkkoeie.
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Laktasie is die periode van melkproduksie deur vrugtige diere/kos.
Step 18
Vergelyk die verandering in melkproduksie en bottervetproduksie gedurende EEN laktasietydperk.
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Melkproduksie sal toeneem terwyl bottervetproduksie geleidelik daal.
Step 19
Gee 'n toepaslike term wat algemeen vir moeilike geboortes gebruik word.
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Die term is 'distrofie'.
Step 20
Verduidelik die rede vir moeilike geboortes.
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Moeilike geboortes kan veroorsaak word deur 'n te groot fetus of 'n beperking in die pelvis area.
Step 21
Gee TWEE bestuursmaatreëls aan om die moontlikheid van moeilike geboortes te verminder.
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Een maatreël is om die voeding van die koeie te monitor, en die ander is om tydige inseminasie te verseker.
Step 22
Definieer die term vasstigheid van die plasenta.
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Vasstigheid van die plasenta verwys na die abnormale verbinding van die plasenta aan die baarmoeder.
