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The Effect of Functional Teat Number...

Obermier, Dalton Richard.

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The Effect of Functional Teat Number on Reproductive Throughput.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The Effect of Functional Teat Number on Reproductive Throughput./
作者:	Obermier, Dalton Richard.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	75 p.
附註:	Source: Masters Abstracts International, Volume: 81-11.
Contained By:	Masters Abstracts International81-11.
標題:	Animal sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28004339
ISBN:	9798643182993

The Effect of Functional Teat Number on Reproductive Throughput.
Obermier, Dalton Richard.

The Effect of Functional Teat Number on Reproductive Throughput. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 75 p.

Source: Masters Abstracts International, Volume: 81-11.

Thesis (M.Sc.)--North Carolina State University, 2020.

This item must not be sold to any third party vendors.

Genetic selection for improving litter size without concurrently increasing the number of functional teats in a linear fashion has resulted in a piglet nutrient access shortage causing reduced piglet survival. Number of piglets born alive is often greater than the number of functional teats in modern maternal lines. This increases competition between piglets and results in nutrient intake shortages. Therefore, the objective of this study was to evaluate the effect of functional teat number on reproductive throughput in swine. Teat traits recorded at farrowing included total teat number (TT), functional teat number (FT), non-functional teat number (NFT), and damaged teat number (DT); whereas functional mammary glands (FG) was measured at weaning on 814 Landrace  Large White F1 females. Sows and litters were evaluated on two levels: biological dam (their own progeny) and wean dam (all piglets nursing sow after crossfostering). Biological dam means for TT, FT, NFT, DT, and FG were 14.43, 13.96, 0.42, 0.03, and 10.70, respectively. Biological dam production traits included litter size at weaning (LSW), average piglet weaning weight (WW), litter weaning weight (LWW), and piglet survival (LSW/TNB) (SURV). Variance components were estimated using gibbs sampler. Biological dam genetic correlations between TT with FT, NFT, FG, LSW, WW, LWW, and SURV were 0.79, 0.49, 0.16, 0.11, 0.37, 0.38, and -0.19, respectively. Biological dam genetic correlations between FT with NFT, FG, LSW, WW, LWW, and SURV were 0.09, 0.28, 0.39, 0.44, 0.49, and 0.35, respectively. An addition of one TT changed LSW, LWW, and SURV by 0.13 piglets, 0.36 kg, and 0.41%, respectively. An increase in one FT changed LSW, LWW, and SURV by 0.32 piglets, 1.28 kg, and 1.63%, respectively. Heritability estimates for TT and FT were 0.24 and 0.21, respectively, indicating that response to selection is feasible. These results suggest that functional teat number is more related and has a greater impact on piglet throughput than total teat number. Results suggest that udder morphology, in particular functional teat number, plays a significant role in piglet survival. Genetic selection to increase functional teat number should be emphasized to improve reproductive throughput.

ISBN: 9798643182993Subjects--Topical Terms:

3174829
Animal sciences.
Subjects--Index Terms:

Functional teat number

The Effect of Functional Teat Number on Reproductive Throughput.
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