The Genetic Relationship between Calving Interval, Body Condition Score and Linear Type and Management Traits in Registered Holsteins

Penelitian ini bertujuan untuk mengetahui jarak beranak (calving interval) pada sapi bali menurut tingkat paritas dan body condition score. Total sampel yang digunakan adalah sebanyak 62 sampel. Penelitian ini merupakan penelitian deskriptif, mencari rata-rata calving interval dan dibedakan berdasarkan body condition score. Hasil penelitian menunjukkan bahwa terdapat beragam nilai calving interval. Jika dilihat dari body condition score 2, rata-rata 15,33 ± 0,94 bulan, 13 ± 1 bulan, 14 bulan, 15 bulan, hingga 16,5 ± 0,5 bulan, semakin tua sapi yang diternakkan maka semakin lama kemunculan estrus postpartum sehingga makin panjang juga periode calving intervalnya. Pada body condition score 3, rata-rata 12,91 ± 1,65 bulan, 12,87 ± 1,65 bulan, 12,5 ± 0,5 bulan, 13,25 ± 0,43 bulan, dan 14 bulan. Faktor penyebab panjangnya calving interval dapat dilihat dari segi ternak, peternak, maupun inseminator. Segi ternak yang mempengaruhi yaitu kesehatan ternak. Segi peternak yang mempengaruhi adalah deteksi birahi, pemeliharaan ternak, dan penyapihan yang dilakukan. Segi inseminator adalah prosedur pelaksanaan dan kualitas semen. Hal ini sangat penting karena jika sapi yang diternakkan mengalami faktor-faktor yang disebutkan maka akan mempengaruhi daripada nilai calving interval yang berakibat pada penurunan pendapatan peternak karena jumlah anak yang dihasilkan akan berkurang selama masa produktif.

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Association between body condition score and live weight in pasture-based Holstein-Friesian dairy cows

Journal of Dairy Research ◽

10.1017/s0022029906002020 ◽

2006 ◽

Vol 73 (4) ◽

pp. 487-491 ◽

Cited By ~ 16

Author(s):

Donagh P Berry ◽

Kevin A Macdonald ◽

John W Penno ◽

John R Roche

Keyword(s):

Body Condition ◽

Body Condition Score ◽

Live Weight ◽

Calving Interval ◽

Regression Analyses ◽

Holstein Friesian ◽

Condition Score ◽

The Mean ◽

Degree Of Association ◽

The Relationship

The objective was to quantify the strength of the relationship between body condition score (BCS) and live weight (LW) in pasture-based Holstein-Friesian dairy cattle, and to determine the kg LW per unit BCS. A total of 26021 test-day records with information on both BCS (1–10 scale, where 1 is emaciated and 10 is obese) and LW across 1110 lactations from one research farm were used in the analysis. Correlation and regression analyses were used to determine the degree of association between BCS and LW in different parities, stages of the inter-calving interval and years. Correlations between BCS and LW were relatively consistent, with the mean correlation between BCS and LW across all data of 0·55 implying that differences in BCS explain approximately 30% of the variation in LW. Significantly different regressions of LW on BCS were present within stage of inter-calving interval by parity subclasses. Excluding calving, LW per unit BCS varied from 17 kg (early to mid lactation in parity 1) to 36 kg (early lactation in parity 4 and 5). However, LW per unit BCS was greatest at calving varying from 44 kg in first parity animals to 62 kg in second parity animals. On average, 1 BCS unit equated to 31 kg LW across all data.

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Selection indexes using calving interval, condition score and milk yield in dairy cattle

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200004191 ◽

2001 ◽

Vol 2001 ◽

pp. 37-37 ◽

Cited By ~ 1

Author(s):

J.E. Pryce ◽

M.P. Coffey ◽

S.H. Brotherstone ◽

J.A. Woolliams

Keyword(s):

Milk Yield ◽

Body Condition ◽

Classification Scheme ◽

Body Condition Score ◽

Selection Criterion ◽

Calving Interval ◽

Condition Score ◽

Selection Indexes ◽

Interval Condition ◽

Type Classification

Increasing genetic merit for production has been associated with a decline in dairy cow fertility. In order to sustain lactation it appears that appreciable amounts of body condition are being mobilised, which may impinge on fertility. Body condition score (BCS) of first lactation heifers is recorded by Holstein UK and Ireland (HUKI) as part of its national type classification scheme. BCS may be a useful selection criterion for improving fertility. Calving dates and hence calving interval (CI) are generally very reliably recorded, but the usefulness of CI as a selection criterion is hampered for a number of reasons, one being that only the most fertile cows have two consecutive calving dates. This is a serious issue that still needs to be addressed. Our aim here was to investigate if there is genetic covariation between BCS and CI after adjustment for milk yield and to investigate selection responses in all three traits when selection is for each trait in turn and how responses are affected by restrictions imposing no genetic change in one of the traits. Restricting a trait to no change when it is correlated to a trait under selection may be important in developing customised indexes to satisfy specific requirements.

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