Effects of Monensin on Growth and Reproductive Performance of Beef Heifers2

Moseley, W.M.; McCartor, M. M.; Randel, R.D.

doi:10.2527/jas1977.455961x

Cited by 54 publications

(19 citation statements)

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“…Recent reports have shown that altering rumen fermentation patterns by varying the quality of dietary energy expedites the onset of puberty. Moseley et al (1977) reported that 77% of monensin-fed heifers reached puberty compared with only 47% of control heifers with similar weight gains. In another study with Brangus heifers, McCartor et al (1979) found that heifers fed diets with lower acetic:propionic acid ratios were younger and weighed less at puberty than heifers fed control diets.…”

Section: Nttoductionmentioning

confidence: 99%

Relationship of Growth and Puberty in Beef Heifers Fed Monensin

Moseley

Dunn

Kaltenbach

et al. 1982

Journal of Animal Science

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An experiment was designed to determine the effects of dietary monensin on age and weight at puberty in Bos taurus crossbred beef heifers. One hundred and forty heifers were allotted to two weight classes: heavy (H) and light (L) groups, consisting of heifers above and below the average weaning weight, respectively. Heifers within each weight class were assigned to one of three diets during a 203-d winter feeding period: (1) R, 80% roughage: 20% concentrate; (2) M1, R diet plus monensin (200 mg/head daily) with feed intake restricted to produce average daily gains (ADG) similar to R and (3) M2, R diet plus monensin (200 mg/head daily). ADG was higher (P less than .001) for M2 heifers than for R and M1 heifers, which performed similarly. Age and weight at puberty were similar across treatments in L heifers. However, in the H group, HM1 and HM2 heifers were younger (P less than .07) at puberty than HR heifers and this difference was not removed by covariate adjustment of either ADG or body weight. Weigh at puberty was greater (P less than .01) for HM2 heifers than for HM1 or HR heifers; however, this difference was removed by covariate adjustment of either ADG or body weight. Ninety-one percent of LM2 heifers and 100% of all other groups had reached puberty before the breeding season. Pregnancy rates did not differ significantly between treatment groups. Supplementation of a high roughage diet with monensin decreased age at puberty of heifers in the heavy weight class and this decrease was not due to increased body weight or ADG. Perhaps heifers with above average weaning weight possess a greater inherent growth potential than heifers below the average weaning weight and hence are more capable of utilizing monensin to an advantage.

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Section: Nttoductionmentioning

confidence: 99%

Relationship of Growth and Puberty in Beef Heifers Fed Monensin

Moseley

Dunn

Kaltenbach

et al. 1982

Journal of Animal Science

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“…The effect of nutritional level on the occurrence of first oestrus in heifers is shown in Table 3. Heifers fed a high level of protein (150% of estimated requirements) grew faster and attained puberty at a younger age and heavier body weight, and had a higher fertility compared to those fed a low level of protein (41% of estimated requirements) (Oyedipe et al, 1982). Moseley et al (1977) found that dietary monensin carrying in 20% natural protein fed produced increased propionate levels that initiate an endocrine response that may speed up onset of puberty and improve conception rate. On the cotrary, Rhodes et al (1978) found that metabolisable energy levels attained by protein protected feedstuffs from rumen fermentation processes are not effective in enhancing the onset of puberty.…”

Section: Nutritionmentioning

confidence: 99%

Puberty in Beef Heifers: A Review

Faidiban

2018

JIPVET

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ABSTRAKPerformans reproduksi optimum dari ternak betina adalah faktor yang sangat penting dalam suatu usaha peternakan sapi potong, sebab sebuah perusahaan peternakan sapi potong hanya dapat berlangsung dengan baik jika ada cukup pedet yang dilahirkan, bertumbuh dengan baik sampai dipasarkan. Pubertas adalah salah satu kriteria reproduksi yang harus dipenuhi oleh ternak sebelum ternak itu dapat bereproduksi. Berbagai penelitian telah dilakukan dan telah diketahui bahwa umur dan bobot saat pubertas pada sapi betina sangat ditentukan oleh bangsa sapi, bobot badan, nutrisi dan musim. Oleh sebab itu, faktor-faktor tersebut perlu diketahui dan dipahami sehingga ternak sapi yang dipelihara dapat diatur untuk bereproduksi seperti yang diharapkan oleh peternak.

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“…Supplementation with rumen undegradable protein (RUP) can improve feed intake, ADG, feed conversion, and provide glucogenic precursors to improve glucose status [6]. Other feed additives have been used to enhance production of glucose by altering ruminal volatile fatty acid (VFA) production using ionophores [15] [16]. When glucose limits metabolic function, propionate salts can be directly fed to supply propionate for gluconeogenesis to potentially enhance weight gain, and nutritional status [17].…”

Section: Introductionmentioning

confidence: 99%

Heifer Body Weight Gain and Reproductive Achievement in Response to Protein and Energy Supplementation While Grazing Dormant Range Forage

Waterman¹,

Sawyer²,

Kane³

et al. 2014

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Heifers grazing winter range require supplemental nutrients to complement dormant forage to achieve optimal growth and performance. A study was conducted to evaluate nutritional environment and effect of different supplementation strategies for developing heifers grazing dormant winter range. Eighty-four Angus crossbred heifers were stratified by body weight at weaning, allocated to one of six replicated pastures, and randomly assigned one of three supplemental treatments: 1) 908 g/d of a control supplement providing 340 g·hd −1 ·d −1 of CP with 130 g of rumen undegradable protein (RUP) and 614 MJ of ME (LRUP); 2) 908 g/d of a RUP supplement providing 340 g·hd −1 ·d −1 of CP with 170 g of RUP and 567 MJ of ME (HRUP); or 3) 1814 g/d of a protein and energy supplement providing 340 g·hd −1 ·d −1 of CP with 120 g of RUP + 100 g of propionate salt (NutroCal ™ , Kemin Industries, Inc.) and 1222 MJ of ME (LRUP + E). Body weights were taken in November, with monthly 12 h shrunk BW from January thru April, and again in September (at time of pregnancy diagnosis). Heifer average daily gain was similar throughout the developmental period except from d125 to d159 where LRUP + E supplemented heifers had greater gains (P < 0.01) than LRUP and HRUP supplemented heifers (0.33, 0.04, and 0.14 ± 0.05 kg/d, respectively). LRUP + E heifers had a greater percentage (P = 0.04) of heifers pubertal at time of artificial insemination compared to LRUP and HRUP heifers (57, 29, and 30, respectively). However, no differences were * Corresponding author. R. C. Waterman et al. 1297 detected in overall pregnancy rates (P = 0.40). This study indicated that feeding more supplemental energy (i.e., propionate salt, ground milo and corn) allowed lightweight heifers to achieve a greater rate of gain at a key period during development and achieved comparable reproductive success to heifers only receiving supplemental protein.

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Effects of Monensin on Growth and Reproductive Performance of Beef Heifers2

Cited by 54 publications

References 0 publications

Relationship of Growth and Puberty in Beef Heifers Fed Monensin

Relationship of Growth and Puberty in Beef Heifers Fed Monensin

Puberty in Beef Heifers: A Review

Heifer Body Weight Gain and Reproductive Achievement in Response to Protein and Energy Supplementation While Grazing Dormant Range Forage

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